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DSolve y'[t]==y[t-a]

• To: mathgroup at smc.vnet.net
• Subject: [mg73219] DSolve y'[t]==y[t-a]
• From: Peter Breitfeld <phbrf at t-online.de>
• Date: Thu, 8 Feb 2007 03:33:00 -0500 (EST)

I want to solve the equation in the subject. If I enter
  DSolve[y'[t] == y[t - a], y[t], t]
I get the error DSolve::ambiguity.

I triede to define
k[t]=y[t-a]
and to solve the resulting system, but this doesn't work either
because the ambiguity of the independent variable remains.

Any ideas?


Gruss Peter
-- 
==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==-==
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de