Consider the function f(x, t) = (x – ct)° + (x + ct)° where c is a constant. Calculate and dx2

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 69EQ: Let x=x(t) be a twice-differentiable function and consider the second order differential equation...
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Consider the function f(x, t) = (x – ct)° + (x + ct)° where c is a constant. Calculate
and
dx2
dx2
dt2
The one-dimensional wave equation is given by
dx2
1 af
and the one-dimensional heat equation is given by
of2 1 What can be said about f?
dt
dx2
O f satisfies the one-dimensional wave equation.
O f neither satisfies the one-dimensional wave equation nor the one-dimensional heat equation.
O f satisfies the one-dimensional heat equation.
O f satisfies both the one-dimensional wave equation and the one-dimensional heat equation.
Transcribed Image Text:Consider the function f(x, t) = (x – ct)° + (x + ct)° where c is a constant. Calculate and dx2 dx2 dt2 The one-dimensional wave equation is given by dx2 1 af and the one-dimensional heat equation is given by of2 1 What can be said about f? dt dx2 O f satisfies the one-dimensional wave equation. O f neither satisfies the one-dimensional wave equation nor the one-dimensional heat equation. O f satisfies the one-dimensional heat equation. O f satisfies both the one-dimensional wave equation and the one-dimensional heat equation.
du
A function u = f(x, y) with continuous second partial derivatives satisfying Laplace's equation
= 0 is called a
dy
harmonic function.
Calculate the indicated derivatives and determine if the function u(x, y) = x' – 3xy is harmonic.
du
dx2
ду?
Is the function u = x² – 3xy harmonic?
O no
yes
O O
Transcribed Image Text:du A function u = f(x, y) with continuous second partial derivatives satisfying Laplace's equation = 0 is called a dy harmonic function. Calculate the indicated derivatives and determine if the function u(x, y) = x' – 3xy is harmonic. du dx2 ду? Is the function u = x² – 3xy harmonic? O no yes O O
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