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ReplaceAll behavour

• To: mathgroup at smc.vnet.net
• Subject: [mg82111] ReplaceAll behavour
• From: magma <maderri2 at gmail.com>
• Date: Fri, 12 Oct 2007 02:59:10 -0400 (EDT)

I do not understand what Mathematica 6 is doing here:

a=5
a/.a->3

gives 3

But...

a+2/. a->3

gives 7

Why is that?

Thank you for your help