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Re: Mathematica not considering an assumption

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82667] Re: Mathematica not considering an assumption
  • From: "David Park" <djmpark at comcast.net>
  • Date: Sun, 28 Oct 2007 03:56:27 -0500 (EST)
  • References: <ffv36o$bf0$1@smc.vnet.net>

In Mathematica 6.0.1

Assuming[a < 0, Integrate[x^a, {x, 5, 6}]]
Limit[%, a -> -1]                                                    gives

(-5^(1 + a) + 6^(1 + a))/(1 + a)
Log[6/5]

-- 
David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


<matematica65 at gmail.com> wrote in message news:ffv36o$bf0$1 at smc.vnet.net...
> Assuming[a < 0,Integrate[x^a, {x, 5, 6}]}]
> 
> This Integral, for a = -1, is equal to Log(6/5)
> 
> Why doesn't Mathematica report it?
> 
> 
> Thank you in advance,
> Leonardo
> 
>


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