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課程名稱︰偏微分方程導論 課程性質︰數學系必修 課程教師︰林紹雄 開課學院:理學院 開課系所︰數學系 考試日期︰2013年03月01日,08:10-09:10 考試時限:60分鐘 是否需發放獎勵金:是 試題 :        Math 2206 (Introdution to PDE) Quiz No.1 (3/01/2013) Name              ID number           Department Solve the follwing problems. Please write down your computational or proof steps clearly on the answer sheets.                        2   2    2 A. (35 points) Consider the first order PDE u ((u_x) + (u_y) ) = 1 with the   Cauchy data u = 1 on the line y = x. Find all admissible initial data on   the line y = x, and determine which admissible data are non-characteristc.   Find all possible solutions.             3 B. Let F(x,y,z,p,q) be C . The PDE F(x,y,u,u_x,u_y) = 0 has the Cauchy data   u(x,y) = h(x,y) along the curve Γ defined by Γ:g(x,y) = 0, where g and h   are C^2 function, and ▽g(x,y)≠0 on Γ.   (a) (5 points) If P = (x*,y*,z*,p*,q*) is an admissible data, write down     the equations satisfied by P.   (b) (10 points) If P in (a) exists, what is the condition for P to be     non-characteristic?  All answers should be expressed in terms of F,g,h at P. C. Determine which of the following statements is true. Prove your anwser.   Each has 10 points.             1                        2 2  (a) There exists u∈C(G) such that u_x + u_y = 0 and u(x,y) = y on x + y = 1,    where G = {(x,y)∈R^2 | 1/2 < x^2 + y^2 < 3/2}.               2     3     2  (b) The Cauchy problem 3xy (u_x) - y (u_y) = 3y / (2x) with Cauchy data    u(x,y) = -y^3 on the curve xy^3 = 1 has infinitely many solutions. 註:教授把characteristic誤打為charateristic,這篇已修正了。 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.112.252.31
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