A function u(x, y) is said to be a harmonic function if uxx + Uyy 0. That is, u is a solution of the Laplace equation. If u is a harmonic function, then -uy dx +ux dy = 0 is an exact equation (you should verify this). By solving this exact equation, one finds the so-called harmonic conjugate function v(x, y) such that vx = -Uy and Vy == ux. If u = 3xy (a harmonic function), then the corresponding exact equation for vis dx+ |dy = 0 and a harmonic conjugate of u is v= help (formulas) If u = 9e cos y (a harmonic function), then the corresponding exact equation for vis dx+ |dy = 0 and a harmonic conjugate of u is v= help (formulas) If u = = 5x³ — 15xy² (a harmonic function), then the corresponding exact equation for vis dx+ - |dy = 0 and a harmonic conjugate of u is v = help (formulas) Book: Section 1.8 of Notes on Diffy Qs

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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A function u(x, y) is said to be a harmonic function if uxx + Uyy 0. That is, u is a solution of the Laplace
equation.
If u is a harmonic function, then -uy dx +ux dy = 0 is an exact equation (you should verify this). By solving this
exact equation, one finds the so-called harmonic conjugate function v(x, y) such that vx = -Uy and Vy == ux.
If u
=
3xy (a harmonic function), then the corresponding exact equation for vis
dx+
|dy = 0
and a harmonic conjugate of u is
v=
help (formulas)
If u
=
9e cos y (a harmonic function), then the corresponding exact equation for vis
dx+
|dy = 0
and a harmonic conjugate of u is
v=
help (formulas)
If u
=
= 5x³ — 15xy² (a harmonic function), then the corresponding exact equation for vis
dx+
-
|dy = 0
and a harmonic conjugate of u is
v =
help (formulas)
Book: Section 1.8 of Notes on Diffy Qs
Transcribed Image Text:A function u(x, y) is said to be a harmonic function if uxx + Uyy 0. That is, u is a solution of the Laplace equation. If u is a harmonic function, then -uy dx +ux dy = 0 is an exact equation (you should verify this). By solving this exact equation, one finds the so-called harmonic conjugate function v(x, y) such that vx = -Uy and Vy == ux. If u = 3xy (a harmonic function), then the corresponding exact equation for vis dx+ |dy = 0 and a harmonic conjugate of u is v= help (formulas) If u = 9e cos y (a harmonic function), then the corresponding exact equation for vis dx+ |dy = 0 and a harmonic conjugate of u is v= help (formulas) If u = = 5x³ — 15xy² (a harmonic function), then the corresponding exact equation for vis dx+ - |dy = 0 and a harmonic conjugate of u is v = help (formulas) Book: Section 1.8 of Notes on Diffy Qs
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