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Solving for "Invalid" Variables

• To: mathgroup at smc.vnet.net
• Subject: [mg27569] Solving for "Invalid" Variables
• From: Alan <kd7cyb at mac.com>
• Date: Wed, 7 Mar 2001 04:08:10 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

Is there a way in Mathematica to solve for "invalid" variables? Example:

Solve[dy+y==dx+x, dy/dx]

This returns a invalid variable error but I want the result to say dy/dx
is equal to something. Is there a way to do this with rules or anything
else I may not know of?

Thanks,
Alan

• Follow-Ups:
  • RE: Solving for "Invalid" Variables
    • From: "Higinio Ramos" <higra@gugu.usal.es>