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The integral surface of the p. d. e satisfying the condition u ( 1 , y ) = y is given by
  • a)
    u(x,y) = y/x
  • b)
    u(x, y) = 
  • c)
    u(x, y) 
  • d)
    u(x,y) = y + x - 1
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The integral surface of the p. d. esatisfying the condition u ( 1 , y ...
Think of the PDE as ∇u⋅(a(x,y),b(x,y))=0∇u⋅(a(x,y),b(x,y))=0 so that, geometrically it must be that dy/dx = [b(x,y)/a(x,y)] The solution of the ODE defines the characteristic curves of the PDE, along which solutions (to the PDE) are constant. Then u(x,y) = f(C) where the function ff is determined from the given auxiliary condition.
For example, here the ODE is dy/dx = y/x
 so C = ln|y/x| 
Then u(x,y) = f(C) = f(ln|y/x|).
To determine f, apply the given condition: u(1,y) = f(ln|y|) = y
⟹ f(y) = ey 
Thus, u(x,y) = exp(ln|y/x|)
= |y/x|
 
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The integral surface of the p. d. esatisfying the condition u ( 1 , y ...
Think of the PDE as ∇u⋅(a(x,y),b(x,y))=0∇u⋅(a(x,y),b(x,y))=0 so that, geometrically it must be that dy/dx = [b(x,y)/a(x,y)] The solution of the ODE defines the characteristic curves of the PDE, along which solutions (to the PDE) are constant. Then u(x,y) = f(C) where the function ff is determined from the given auxiliary condition.
For example, here the ODE is dy/dx = y/x
 so C = ln|y/x| 
Then u(x,y) = f(C) = f(ln|y/x|).
To determine f, apply the given condition: u(1,y) = f(ln|y|) = y
⟹ f(y) = ey 
Thus, u(x,y) = exp(ln|y/x|)
= |y/x|
 
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The integral surface of the p. d. esatisfying the condition u ( 1 , y ) = y is given bya)u(x,y) = y/xb)u(x, y) =c)u(x, y)d)u(x,y) = y + x - 1Correct answer is option 'A'. Can you explain this answer?
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The integral surface of the p. d. esatisfying the condition u ( 1 , y ) = y is given bya)u(x,y) = y/xb)u(x, y) =c)u(x, y)d)u(x,y) = y + x - 1Correct answer is option 'A'. Can you explain this answer? for Mathematics 2024 is part of Mathematics preparation. The Question and answers have been prepared according to the Mathematics exam syllabus. Information about The integral surface of the p. d. esatisfying the condition u ( 1 , y ) = y is given bya)u(x,y) = y/xb)u(x, y) =c)u(x, y)d)u(x,y) = y + x - 1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mathematics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The integral surface of the p. d. esatisfying the condition u ( 1 , y ) = y is given bya)u(x,y) = y/xb)u(x, y) =c)u(x, y)d)u(x,y) = y + x - 1Correct answer is option 'A'. Can you explain this answer?.
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