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Heat diffusion equation

Three-dimensional diffusion equation For a three-dimensional case of heat conduction, heat flows no longer have to be considered in one dimensional direction only, but in all three directions (this also applies to the mass flows in the case of diffusion) Mathematically, the heat diffusion equation is a differential equation that requires integration constants in order to have a unique solution. Boundary conditions are in fact the mathematical expressions or numerical values necessary for this integration. View chapter Purchase book Black Hole Entropy and the Thermal Worm Mode

Heat Diffusion Equation The Terms - Temperature [Units: K, Kelvin] - Time [Units: s] - Thermal diffusivity, material specific. (thermal conductivity divided by the volumetric heat capacity - the product of the density and the specific heat capacity [Units: m 2 s-1] - Laplace operator, second order partial differential operator with respect to the three spatial directions, - Rate of heat input. Equation 2.18 is the general form, in Cartesian coordinates, of the heat diffusion equation. This equation, usually known as the heat equation, provides the basic tool for heat conduction analysis. From its solution, we can obtain the temperature distribution T (x,y,z) as a function of time. Equation 2.18 describes conservation of energy The diffusion equation is a parabolic partial differential equation. In physics, it describes the macroscopic behavior of many micro-particles in Brownian motion, resulting from the random movements and collisions of the particles (see Fick's laws of diffusion)

Derivation of heat equation (diffusion equation) - tec-scienc

Below we provide two derivations of the heat equation, ut¡kuxx= 0k >0:(2.1) This equation is also known as the diffusion equation. 2.1.1 Diffusion Consider a liquid in which a dye is being diffused through the liquid. The dye will move from higher concentration to lower concentration An introduction to partial differential equations. PDE playlist: http://www.youtube.com/view_play_list?p=F6061160B55B0203 Topics: -- intuition for one dimens.. The difference is typically the diffusion coefficient : (diffusion) ∂ ψ ∂ t = ∇ ⋅ (κ ∇ ψ) (heat) ∂ ψ ∂ t = κ ∇ 2 ψ Under the diffusion equation, we typically take κ to be a spatially-dependent variable whereas in the heat equation it is a uniform constant (allowing us to use the Laplacian on ψ) L'équation de la chaleur s'exprimera donc sous la forme suivante : ∂ ∂ + ∇ ⋅ = ou ∂ ∂ + ∇ ⋅ = La propagation de l'énergie se fait par un mécanisme brownien de phonons et de porteurs de charge électrique (électrons ou trous), donc à une échelle caractéristique très petite devant celles du problème macroscopique. Il est donc décrit par une équation de type diffusion. Solve a heat equation that describes heat diffusion in a block with a rectangular cavity. Heat Distribution in Circular Cylindrical Rod. Analyze a 3-D axisymmetric model by using a 2-D model. Heat Conduction in Multidomain Geometry with Nonuniform Heat Flux. Perform a 3-D transient heat conduction analysis of a hollow sphere made of three different layers of material, subject to a nonuniform.

Heat Diffusion Equation - an overview ScienceDirect Topic

  1. Derives the heat equation using an energy balance on a differential control volume. Made by faculty at the University of Colorado Boulder Department of Chemi..
  2. 7.1 The Diffusion Equation in 1D Consider an IVP for the diffusion equation in one dimension: ∂u(x,t) ∂t =D ∂2u(x,t) ∂x2 (7.3) on the interval x ∈ [0,L] with initial condition u(x,0)= f(x), ∀x ∈ [0,L] (7.4) and Dirichlet boundary conditions u(0,t)=u(L,t)=0 ∀t >0. (7.5
  3. e how the heat content changes within this volume as a function of time. Consider a cubic volume element with sides of length dx, dy, and dz and volume, dV = dxdydz. Figure 2.1.6: Heat Flow in 3
  4. Recall that the heat equation is ∂u ∂t −∆u= f in Q, together with an initial condition u(x,0)=u0(x) in Ω, and boundary values, for instance Dirichlet boundary values u(x,t)=g(x,t) on ∂Ω×]0,T[, where f, u0and g are given functions

For an anisotropic medium, the heat equation contains in place of λ the thermal conductivity tensor λ ik, where i, k = 1,2,3. In the case of an istropic homogeneous medium, the heat equation assumes the form where Δ is the Laplace operator, a 2 = λ/ (ρcv) is the coefficient of thermal diffusivity, and f = F/ (ρcv) diffusion equation, also often referred to as a heat equation. With only a first-order derivative in time, only one initial conditionis needed, while the second-order derivative in space leads to a demand for two boundary conditions. The parameter \({\alpha}\)must be given and is referred to as th Heat (or Diffusion) equation in 1D* • Derivation of the 1D heat equation • Separation of variables (refresher) • Worked examples *Kreysig, 8th Edn, Sections 11.4b. Physical assumptions • We consider temperature in a long thin wire of constant cross section and homogeneous material • The wire is perfectly insulated laterally, so heat flows only along the wire insulation heat flow.

The heat equation governs heat diffusion, as well as other diffusive processes, such as particle diffusion or the propagation of action potential in nerve cells. Although they are not diffusive in nature, some quantum mechanics problems are also governed by a mathematical analog of the heat equation (see below). It also can be used to model some phenomena arising in finance, like the Black. The working principle of solution of heat equation in C is based on a rectangular mesh in a x-t plane (i.e. space-time plane) with the spacing h along x direction and k along t direction or. Simply, a mesh point (x,t) is denoted as (ih,jk). The calculations are based on one dimensional heat equation which is given as: δu/δt = c2*δ2u/δx 2D heat Equation. 0.0. 0 Ratings. 6 Downloads. Updated 06 Apr 2016. View License × License.

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Heat Diffusion Equation - University of Warwic

The heat equation we have been dealing with is homogeneous - that is, there is no source term on the right that generates heat. We can show that the total heat is conserved for solutions obeying the homogeneous heat equation. That is, the relation below must be satisfied In this section we go through the complete separation of variables process, including solving the two ordinary differential equations the process generates. We will do this by solving the heat equation with three different sets of boundary conditions. Included is an example solving the heat equation on a bar of length L but instead on a thin circular ring Diffusion equations describe the movement of matter, momentum and energy through a medium in response to a gradient of matter, momentum and energy respectively (see 'Geochemical dispersion', Chapter 5).The general dimensions of diffusion are (L 2 T 1).Since flow is always away from a region of high concentration to one of lower concentration The heat equation, also known as di usion equation, describes in typical physical applications the evolution in time of the density uof some quantity such as heat, chemical concentration, population, etc. Let Vbe any smooth subdomain, in which there is no source or sink. Then the rate of change of the total quantity within V equals the negative of the net ux F through @V: d dt Z V udx= Z @V F. Answer to: Derive the heat diffusion equation for spherical coordinates beginning with the differential control volume shown below. By signing up,..

The Heat Diffusion Equation - Cdee

Diffusion equation - Wikipedi

The equations are as follows. I write the heat equation as- ∂ T ∂ t = k ρ C p ∂ 2 T ∂ x 2 + 1 ρ C p (ρ Δ H M W ∂ m ∂ t) The ∂ m ∂ t is basically the rate of reaction expressed in terms of the mole fraction m Moving body If a body is moving relative to a frame of reference at speed u xand conducting heat only in the direction of motion, then the equation in that reference frame (for constant properties) is: ∂T ∂T ∂2T q˙ +u x= α + ∂t ∂x ∂x2ρ

Estimating the derivatives in the diffusion equation using the Taylor expansion. This is the one-dimensional diffusion equation: The Taylor expansion of value of a function u at a point ahead of the point x where the function is known can be written as: Taylor expansion of value of the function u at a point one space step behind: Solving the first Taylor expansion above for and dropping all. FD1D_HEAT_EXPLICIT is a MATLAB library which solves the time-dependent 1D heat equation, using the finite difference method in space, and an explicit version of the method of lines to handle integration in time.. This program solves dUdT - k * d2UdX2 = F(X,T) over the interval [A,B] with boundary condition Consider the plane wall of thickness 2L, in which there is uniform and constant heat generation per unit volume, q V [W/m 3]. The centre plane is taken as the origin for x and the slab extends to + L on the right and - L on the left. For constant thermal conductivity k, the appropriate form of the heat equation, is Heat Diffusion Equation: Details A major objective in a conduction analysis is to determine the temperature field in a medium resulting from conditions imposed on its boundaries. That is, it is desired to know the temperature distribution, which represents how temperature varies with position in a medium. Once this distribution is known, the conduction heat flux at any point in the medium or.

We have already seen the derivation of heat conduction equation for Cartesian coordinates. Now, consider a cylindrical differential element as shown in the figure. We can write down the equation i The general heat equation describes the energy conservation within the domain , and can be used to solve for the temperature field in a heat transfer model. Since it involves both a convective term and a diffusive term, the equation (12) is also called the convection-diffusion equation Heat Diffusion Equation (3) 4 1-D, Steady Heat Transfer T T(x0)100CC2 T(x1 m)20CC1C2, C1-80C T(x)100-80x (C) 100 20 x 5 1-D Heat Transfer (cont.) T1 T2 q (I) Electric circuit analogy x T2 (V2) I (V1-V2)/R T1 (V1) L R (R) 6 Composite Wall Heat Transfer T k2 k1 T1 T2 R1L1/(k1A) R2L2/(k2A) T1 T2 T L1 L2 Note In the US, insulation materials are often specified in terms of their thermal resistance. 2D Heat Equation solver in Python. Contribute to JohnBracken/PDE-2D-Heat-Equation development by creating an account on GitHub CBE 255 Diffusion and heat transfer 2014 Using this fact to simplify the previous equation gives k b2 —T1 T0- @ @˝ k b2 —T1 T0- @2 @˘2 Simplifying this result gives the dimensionless heat equation @ @˝ @2 @˘2 dimensionless heat equation Notice that no parameters appear in the dimensionless heat equation. We will see shortly.

When the diffusion equation is linear, sums of solutions are also solutions. Here is an example that uses superposition of error-function solutions: Two step functions, properly positioned, can be summed to give a solution for finite layer placed between two semi-infinite bodies. 3.205 L3 11/2/06 8 Figure removed due to copyright restrictions Question: Required Concepts: Solving Heat Diffusion Equation In Cartesian And Polar Co-ordinates Problem 1 A Long Electric Wire Of Radius R. Generates Heat At A Rate Q. The Surface Is Maintained At Uniform Temperature T. Write The Heat Equation And Boundary Conditions For Steady State One-dimensional Conduction A fundamental ring solution of the 2d Diffusion Equation which is centered at the origin can be found by integrating the fundamental solution shown above over thetao from 0 to 2pi, and dividing by. The heat equation Homogeneous Dirichlet conditions Inhomogeneous Dirichlet conditions TheHeatEquation One can show that u satisfies the one-dimensional heat equation u t = c2u xx. Remarks: This can be derived via conservation of energy and Fourier's law of heat conduction (see textbook pp. 143-144). The constant c2 is the thermal diffusivity: K 0 = thermal conductivity, c2 = K 0 sρ, s.

PDE Heat equation: intuition - YouTub

  1. Example sentences with heat equation, translation memory. add example. en The coupled electron-ion heating equations, neglecting losses, in a CO2 laser heated solenoid are solved for a laser intensity varying with time as I = I0t2/3. Giga-fren. fr Les équations couplées de chauffage électron-ion, en négligeant les pertes, dans un solenoide chauffé par un laser au CO2, sont résolues.
  2. heat diffusion equation pertains to the conductive trans- port and storage of heat in a solid body. The body itself, of finite shape and size, communicates with the external world by exchanging heat across its boundary. Within the solid body, heat manifests itself in the form of temper- ature, which can be measured accurately. Under these conditions, Fourier's differential equation mathemati.
  3. 23 Heat Transfer Introduction to Conduction Conduction Rate Equation Thermal Properties of Matter Heat Diffusion Equation 20 Boundary and Initial Conditions Dept. of Mechanical Engineering Faculty of Engineering Heat diffusion equation Solution Solution I Solving HDE > T (x, y, z, t) I HDE is second order in the spatial coordinates, two.

L'équation de diffusion est une équation aux dérivées partielles.En physique, elle décrit le comportement du déplacement collectif de particules (molécules, atomes, photons. neutrons, etc.) ou de quasi-particules comme les phonons dans un milieu causé par le mouvement aléatoire de chaque particule lorsque les échelles de temps et d'espace macroscopiques sont grandes devant leurs. The equations are coupled through the thermal fission term the fast removal term.In this system of equations we assume that neutrons appear in the fast group as the result of fission induced by thermal neutrons (therefore Φ 2 (x)). In the fission term, k ∞ is to infinite multiplication factor and p is the resonance escape probability.The fast absorption term expresses actually neutrons that.

which is the diffusion equation of heat accros any material with a constant κ the coefficient κ called diffusion constant is specific for each material. κ = K/C v. C v is the specific heat and K is the thermal conductivity In geometry processing and shape analysis, several problems and applications have been addressed through the properties of the solution to the heat diffusion equation and to the optimal transport. For instance, diffusion kernels allow us to define diffusion distances, shape descriptors and clustering methods, to approximate geodesics and optimal transport distances, to deform 3D shapes, to. Heat Equation (redirected from Heat Diffusion) heat equation [′hēt i‚kwā·zhən] (thermodynamics) A parabolic second-order differential equation for the temperature of a substance in a region where no heat source exists: ∂ t /∂τ = (k /ρ c) ∂ 2 t /∂ x 2 + ∂ 2 t /∂ y 2 + ∂ t 2 /∂ z 2), where x, y, and z are space coordinates, τ is the time, t (x,y,z, τ) is the. View heat diffusion equation.ppt from PHY 235 at MedTech College. Heat Diffusion Equation All go to zero dE dE g dW Energy balance equation: qin q out E1 E2 dt dt dt Apply this equation to a soli The diffusion equation (parabolic) (D is the diffusion coefficient) is such that we ask for what is the value of the field (wave) at a later time t knowing the field at an initial time t=0 and subject to some specific boundary conditions at all times. The domain may be 1-D, 2-D, or 3-D. This equation might represent a heat diffusion problem in which the temperature within the domain is sought.

Heat Conduction in a Large Plane Wall. Example of Heat Equation - Problem with Solution. Consider the plane wall of thickness 2L, in which there is uniform and constant heat generation per unit volume, q V [W/m 3].The centre plane is taken as the origin for x and the slab extends to + L on the right and - L on the left This equation is the 1D diffusion equation. It is occasionally called Fick's second law. In many problems, we may consider the diffusivity coefficient D as a constant. In that case, the equation can be simplified to 2 2 x c D t c Remember, however, that in an environmental context D is likely to represent the effect of turbulent fluctuations, which may have spatially varying statistics. The heat equation has a similar form on manifolds. However do not know distances and the heat kernel. Turns out (by careful analysis using differential geometry) that these issues do not affect algorithms. Algorithm. Algorithm Reconstructing eigenfunctions of Laplace-Beltrami operator from sampled data (LaplacianEigenmaps, Belkin, Niyogi2001). 1. Construct a data-dependent weighted graph. 2.

Lectures on Heat Transfer - Introduction - Applications

heat-equation diffusion-equation finite-element-methods Updated Apr 17, 2019; R; Mihail-Kukuev / VDir2DParSudoku Star 0 Code Issues Pull requests Variable directions method for heat equation with parallel implementation using MPI and sudoku mapping. mpi heat-equation. When you click Start, the graph will start evolving following the heat equation u t = u xx. You can start and stop the time evolution as many times as you want. Moreover, if you click on the white frame, you can modify the graph of the function arbitrarily with your mouse, and then see how every different function evolves. Note that the boundary conditions are enforced for t>0 regardless of.

Image processing is fun !: Heat equation removes noise1-D Steady State Heat Transfer With Heat GenerationHeat equation: Separation of variables - YouTube

What is the difference between the diffusion equation and

Random Walk and the Heat Equation Gregory F. Lawler Department of Mathematics, University of Chicago, Chicago, IL 60637 E-mail address: lawler@math.uchicago.edu. Contents Preface 1 Chapter 1. Random Walk and Discrete Heat Equation 5 §1.1. Simple random walk 5 §1.2. Boundary value problems 18 §1.3. Heat equation 26 §1.4. Expected time to escape 33 §1.5. Space of harmonic functions 38 §1.6. Fluid Flow, Heat Transfer, and Mass Transport Diffusion Diffusion Equation Fick's Laws. The simplest description of diffusion is given by Fick's laws, which were developed by Adolf Fick in the 19th century:. The molar flux due to diffusion is proportional to the concentration gradient

Équation de la chaleur — Wikipédi

The most common applications are particle diffusion, where c is interpreted as a concentration and D as a diffusion coefficient; and heat diffusion where c is the temperature and D is the thermal conductivity. It has also found use in finance and is closely related to Schrodinger's Equation for a free particle. But before delving into those. Whether the solutions of the heat equation and diffusion equation are the same (or at least similar in form, bar the material constants) will depend on boundary and initial conditions. The boundary conditions I used in the linked example do yield eigenvalues for $\lambda$ without particular problems. $$\frac{\partial u}{\partial x}=0\:\text{at } x=0, x=L$$ A good discussion of various types of. Définitions de Heat_diffusion, synonymes, antonymes, dérivés de Heat_diffusion, dictionnaire analogique de Heat_diffusion (anglais Dans ce travail on se propose d'établir des estimations d'erreurs a priori pour les solutions approchées d'équations d'évolution obtenues par la méthode d'éléments finis mixte duale en espace et ce pour trois types de problèmes : le premier concerne le problème de Cauchy pour l'équation de diffusion de la chaleur, le second est le problème de Stokes instationnaire, et le dernier. To set a common colorbar for the four plots we define its own Axes, cbar_ax and make room for it with fig.subplots_adjust.The plots all use the same colour range, defined by vmin and vmax, so it doesn't matter which one we pass in the first argument to fig.colorbar.. The state of the system is plotted as an image at four different stages of its evolution

Heat Transfer - MATLAB & Simulink - MathWorks Franc

I am trying to solve the 2D heat equation (or diffusion equation) in a disk: NDSolve[{\!\( \*SubscriptBox[\(\[PartialD]\), \(t\)]\(f[x, y, t. Heat Diffusion Equation. Feedback processes abound in nature and, over the last few decades, the word feedback, like a computer, has found its way into our langu.. Diffusion equation: | The |diffusion equation| is a |partial differential equation| which describes density dyn... World Heritage Encyclopedia, the aggregation of the largest online encyclopedias available, and the most definitive collection ever assembled Solving The Heat Diffusion Equation 1d Pde In Matlab. Diffusion In 1d And 2d File Exchange Matlab Central. Non Linear Heat Conduction Crank Nicolson Matlab Answers. Ch11 8 Heat Equation Implicit Backward Euler Step Unconditionally Stable Wen Shen. Solving Partial Diffeial Equations. Cfd Navier Stokes File Exchange Matlab Central . Finite Difference Method Example Heat Equation. Solving Partial.

Heat Equation Derivation - YouTub

Partial differential equation heat/diffusion equation 3d. 0. NDSolve diffusion equation NDSolve::ndnum. 2. Issues with NDSolve when solving a system of two coupled PDEs. Hot Network Questions How do I control my mind? Does the Grappler feat give advantage on a subsequent shove attempt vs your grappled target?. In financial mathematics it is used to solve the Black-Scholes partial differential equation. The diffusion equation, a more general version of the heat equation, arises in connection with the study of chemical diffusion and other related processes

2.1: The Diffusion Equation - Geosciences LibreText

Fluid Flow, Heat Transfer, and Mass Transport Convection Convection-Diffusion Equation Combining Convection and Diffusion Effects. Whenever we consider mass transport of a dissolved species (solute species) or a component in a gas mixture, concentration gradients will cause diffusion Finite Difference Method to solve Heat Diffusion Equation in Two Dimensions. version 1.0.0.0 (1.88 KB) by Sathyanarayan Rao. Heat diffusion equation of the form Ut=a(Uxx+Uyy) is solved numerically. All units are arbitrary. 4.0. 6 Ratings. 36 Downloads. Updated 12 Jul 2013. View License × License. Follow; Download. Overview; Functions; This code employs finite difference scheme to solve 2-D. Advection-diffusion equation in 1D¶ To show how the advection equation can be solved, we're actually going to look at a combination of the advection and diffusion equations applied to heat transfer. We're looking at heat transfer in part because many solutions exist to the heat transfer equations in 1D, with math that is straightforward to.

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Heat Diffusion Equation Article about Heat Diffusion

We have given some exact (invariant) solutions to nonlinear heat diffusion equations with temperature-dependent conductivity and time-dependent heat transfer coefficient. Acknowledgments. Raseelo J. Moitsheki wishes to thank the National Research Foundation of South Africa under Thuthuka program, for the generous financial support. The author is also grateful to the anonymous reviewers for. A partial differential equation describing the variation in space and time of a physical quantity that is governed by diffusion. The diffusion equation provides a good mathematical model for the variation of temperature through conduction of heat and the propagation of electromagnetic waves in a highly conducting medium 1 Theories of Diffusion Diffusion Heat equation Linear Parabolic Equations Nonlinear equations 2 Degenerate Diffusion and Free Boundaries Introduction The basics Generalities 3 Fast Diffusion Equation Fast Diffusion Ranges J. L. Vazquez (UAM) Nonlinear Diffusion 3 / 47. Diffusion Populations diffuse, substances (like particles in a solvent) diffuse, heat propagates, electrons and ions diffuse. The heat equation f(x) ≥ 0 and define sets Bδ= {x : f(x) > δ}. If f is not identically zero (excluding sets of zero Lebesgue measure) then Bδis nonempty for some δ and there is a bounded set A ⊆ Bδwith positive measure. Then u(t,x) = Z+∞ − ∂t =∇·(K∇T)+ A,(6.5) which is an example of a diffusion equation. It is a second-order partial differential equation with a double spatial derivative and a single time derivative. If we assume that K has no spatial variation, and if we introduce the thermal diffusivit

Diffusion in 1D and 2D - File Exchange - MATLAB Central

The 1D diffusion equation - GitHub Page

1D Diffusion (The Heat equation) Solving Heat Equation with Python (YouTube-Video) The examples above comprise numerical solution of some PDEs and ODEs. There is no an example including PyFoam (OpenFOAM) or HT packages. I assure you that as you check examples regarding numerical solution like above, you would properly understand how numerical study works in Pyhton. Don't afraid to keep. The first PDE is the Laplace-equation. As a solution it delivers the electrical potential field. This potential field is used to calculate the joule-heating, which is the source term in the heat-diffusion equation. Thus, for subseqent analysis we can regard the potential field/joule heating as given The diffusion flux (J) measures the amount of substance that flows through a unit area during a unit time interval, measured in g/m 2. The diffusion coefficient (D), measured in area per unit time m 2 /s.It is proportional to the squared velocity of the diffusing particles, which depends on the temperature, viscosity of the fluid, and the size of the particles K the thermal conductivity is constant, which means you should be able to write your steady state equation as Laplace equation: Δ T = 1 r ∂ ∂ r (r ∂ T ∂ r) + 1 r 2 ∂ 2 T ∂ θ 2 = 0 Turns out you don't actually need the value of thermal conductivity to find the temperature distribution, only to find the heat current later

Browse other questions tagged partial-differential-equations heat-equation or ask your own question. Featured on Meta Hot Meta Posts: Allow for removal by moderators, and thoughts about futur Transport equations : Mass and heat balances 9 mars 2017 The transport equations for mass and heat are obtained from conservation laws of mass, on one hand, and energy, on the other hand. We consider a volume V xed in space and bounded by a surface @V = Sand we write the balance between the change of mass or energy within V and the net uxes of mass or energy crossing the bounding surface S. Di. The diffusion equation is derived by making up the balance of the substance using Nerst's diffusion law. It is assumed in so doing that sources of the substance and diffusion into an external medium are absent in the domain under consideration. Such a diffusion equation is said to be homogeneous. If the domain under consideration contains sources of the substance with a volume distribution. This model simulates a classic partial differential equation problem (that of heat diffusion). The thin square plate is a typical example, and the simplest model of the behavior. Try changing the shape or thickness of the plate (e.g. a circular or elliptical plate), or adding a hole in the center (the plate would then be a slice of a torus, a doughnut-shaped geometric object). Add a slider to. The one dimensional heat conduction equation u t = α u x x or ∂ u ∂ t = α ∂ 2 u ∂ x 2, where α = κ / (ρ c p) is a constant known as the thermal diffusivity, κ is the thermal conductivity, ρ is the density, and cp is the specific heat of the material in the bar S(x y;t)˚(y)dy = 1 p 4ˇ t Z1 1 e(x y) 2 4 t˚(y)dy : This is the solution of the heat equation for any initial data ˚. We derived the same formula last quarter, but notice that this is a much quicker way to nd it

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