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Re: Bug in math4

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20698] Re: [mg20633] Bug in math4
  • From: Hendrik van Hees <h.vanhees at gsi.de>
  • Date: Mon, 8 Nov 1999 02:48:44 -0500
  • Organization: GSI Darmstadt
  • References: <8038b8$af5@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

What's also interesting is that one can get the correct result as
follows:

vanhees at tp-hees:~ > math 
Mathematica 4.0 for Students: Linux Version
Copyright 1988-1999 Wolfram Research, Inc.
 -- Motif graphics initialized -- 

In[1]:= f[x_] = Integrate[Sqrt[2 - Sin[x]], x]

                     Pi
                     -- - x
                     2
Out[1]= -2 EllipticE[------, -2]
                       2

In[2]:= N[f[4]-f[1]]

Out[2]= 3.73785

It seems that Mathematica solves a definite integral different from an
indefinite one. That's rather strange.
-- 
Hendrik van Hees		Phone:  ++49 6159 71-2755
c/o GSI-Darmstadt SB3 3.162	Fax:    ++49 6159 71-2990
Planckstr. 1			mailto:h.vanhees at gsi.de
D-64291 Darmstadt		http://www.gsi.de/~vanhees/index.html


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