32. Harmonic functions A function f(x, y, z) is said to be harmonic in a region D in space if it satisfies the Laplace equation a²f ду? a²f a²f V²f = V • Vƒ = ax? dz? throughout D. a. Suppose that ƒ is harmonic throughout a bounded region D enclosed by a smooth surface S and that n is the chosen unit normal vector on S. Show that the integral over S of Vf•n, the derivative of f in the direction of n, is zero. b. Show that if f is harmonic on D, then fVf•n do = II \vs|² av. IV.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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32. Harmonic functions A function f(x, y, z) is said to be harmonic
in a region D in space if it satisfies the Laplace equation
a²f
ду?
a²f
a²f
V²f = V • Vƒ =
ax?
dz?
throughout D.
a. Suppose that ƒ is harmonic throughout a bounded region D
enclosed by a smooth surface S and that n is the chosen unit
normal vector on S. Show that the integral over S of Vf•n,
the derivative of f in the direction of n, is zero.
b. Show that if f is harmonic on D, then
fVf•n do =
II \vs|² av.
IV.
Transcribed Image Text:32. Harmonic functions A function f(x, y, z) is said to be harmonic in a region D in space if it satisfies the Laplace equation a²f ду? a²f a²f V²f = V • Vƒ = ax? dz? throughout D. a. Suppose that ƒ is harmonic throughout a bounded region D enclosed by a smooth surface S and that n is the chosen unit normal vector on S. Show that the integral over S of Vf•n, the derivative of f in the direction of n, is zero. b. Show that if f is harmonic on D, then fVf•n do = II \vs|² av. IV.
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