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MathGroup Archive 2000

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I do not understand

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25381] I do not understand
  • From: "Borut L" <justmyname at email.si>
  • Date: Fri, 29 Sep 2000 01:06:13 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

ySer=Series[y[t],{t,0,3}]

If I apply this rule like this
(y[t]+y'[t])/.y[t]->ySer
both y[t] and y'[t] changes appropriately

If I apply
y'[t]/.y[t]->ySer
nothing happens


Why is that?




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