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simple PDE?

• To: mathgroup at smc.vnet.net
• Subject: [mg124927] simple PDE?
• From: "Manuel G. Cerpa" <cercman at gmail.com>
• Date: Sun, 12 Feb 2012 05:05:10 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi members:
I need your help with this problem:
D[z[x,y],x] + D[z[x,y],y] + b*z[x,y] = 0, z[0,y]=1-Exp[-1000*y], z[x,
0]=0, 0<x<1, y>0, b>0.
Using NDSolve with MethodOfLines, I have a error: mxst.
How solve it?
Best regards.