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MathGroup Archive 2004

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Re: wierd differential

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51058] Re: [mg51032] wierd differential
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sun, 3 Oct 2004 05:47:25 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200410020718.DAA26308@smc.vnet.net>
  • Reply-to: murray at math.umass.edu
  • Sender: owner-wri-mathgroup at wolfram.com

Nothing weird: "e" is just another constant; like for any constant c, 
the derivative of c^x with respec to x is Log[c] c^x.

Perhaps you meant the Naperian base E?  (Which, if you prefer it to 
appear lower-case, you can type as Esc ee Esc.)

ALL -- I repeat: ALL -- built-in primitives in Mathematica begin with 
upper-case letters.  Hence one-character built-in primitives are upper 
case:  C, D, E, I, N.

It is essential to learn such basic principles to avoid distress when 
beginning to use Mathematica!

YOUNGWHAN wrote:
> 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?
> 
> 
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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