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RE: Integrate (deutsch)
*To*: MathGroup at yoda.physics.unc.edu
*Subject*: RE: Integrate (deutsch)
*From*: reiszig at e-technik.tu-dresden.dbp.de
*Date*: Mon, 8 Mar 1993 16:47:49 +0100
------------------------------ Start of body part 1
Hallo,
Mr. Deutsch had a problem concerning Integrate (see below).
The reason for Simplify not to change the form of Out[1] into
1/4 (x + c)^4 is that Out[1] is different from that.
Try
Integrate[ (xx + c)^3,{xx,-c,x}], maybe a Factor is needed thereafter.
G. Reiszig, Dresden, 8 Mar 93
Mr. Deutsch's mail:
------------------------------ Start of body part 2
- OSITEL/400 message -
SubmissionTime: 04/03/93-22:00:57
DeliveryTime: 06/03/93-09:20:55
Originator: C=de;A=dbp;P=edu;O=bu;OU=bu-pub;S=deutsch
PrimaryRecipients: C=de;A=dbp;P=edu;O=unc;OU=physics;OU=yoda;S=mathgroup
Subject: Integrate
Importance: normal
Hello Mathgroup,
I have a question which I suspect has been discussed before.
Is there a reason why Integrate[ (x + c)^3, x ] does not return
(x + c)^4
---------
4
Instead here is the result:
Mathematica 2.0 for SPARC
Copyright 1988-91 Wolfram Research, Inc.
-- X11 windows graphics initialized --
In[1]:= Integrate[ (x + c)^3, x ]
2 2 4
3 3 c x 3 x
Out[1]= c x + ------- + c x + --
2 4
In[2]:= Simplify[%]
2 2 4
3 3 c x 3 x
Out[2]= c x + ------- + c x + --
2 4
In[3]:= D[%,x]
3 2 2 3
Out[3]= c + 3 c x + 3 c x + x
In[4]:= Simplify[%]
3
Out[4]= (c + x)
Clearly, the output Out[1] is correct but
is there some way to force Out[1] to look like:
(x + c)^4
---------
4
Simplify, doesn't seem to do the job either.
David Deutsch
Information Technology
Boston University
deutsch at it.bu.edu
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