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MathGroup Archive 2000

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I do not understand

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



If I apply this rule like this
both y[t] and y'[t] changes appropriately

If I apply
nothing happens

Why is that?

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