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

**References**:**wierd differential***From:*"YOUNGWHAN" <ywsong@buffalo.edu>