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Re: wierd differential

• To: mathgroup at smc.vnet.net
• Subject: [mg51062] Re: [mg51032] wierd differential
• From: "David Park" <djmp at earthlink.net>
• Date: Sun, 3 Oct 2004 05:47:32 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Because Mathematica always begins all its reserved symbols with a capital
letter. So you want to use E instead of e.

D[1 - E^(-2*(y + 1)), y]
2/E^(2*(1 + y))

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/



From: YOUNGWHAN [mailto:ywsong at buffalo.edu]
To: mathgroup at smc.vnet.net



When I put

\!\(D[1 - e\^\(\(-2\) \((y + 1)\)\), y]\)

and, the result

\!\(2\ e\^\(\(-2\)\ \((1 + y)\)\)\ Log[e]\)

why Log[e] is added?