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RE: Peculiar output from DSolve

• To: mathgroup at smc.vnet.net
• Subject: [mg37004] RE: [mg36994] Peculiar output from DSolve
• From: "DrBob" <drbob at bigfoot.com>
• Date: Sun, 6 Oct 2002 05:32:44 -0400 (EDT)
• Reply-to: <drbob at bigfoot.com>
• Sender: owner-wri-mathgroup at wolfram.com

It isn't so.  The solution is an arbitrary function of (1/2)*(x^2 +
y^2)]}}.

Bobby

-----Original Message-----
From: Selwyn Hollis [mailto:selwynh at earthlink.net] 
To: mathgroup at smc.vnet.net
Subject: [mg37004] [mg36994] Peculiar output from DSolve


In:  DSolve[y*D[u[x, y],x] == x*D[u[x, y],y], u[x,y], {x, y}]

Out:  {{u[x, y] -> C[1][(1/2)*(x^2 + y^2)]}}

Square brackets are used as grouping symbols in the result!??  :^O

Somebody say it isn't so.

---
Selwyn Hollis