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?