Re: Re: MaxValue
- To: mathgroup at smc.vnet.net
- Subject: [mg99150] Re: [mg99108] Re: [mg99084] MaxValue
- From: "Ned Lieb" <okty.gy.ned at gmail.com>
- Date: Tue, 28 Apr 2009 04:48:23 -0400 (EDT)
- Reply-to: okty.gy.ned at gmail.com
Why don't you just use the equivalent exponent? It would probably be faster
------Original Message------
From: Bob Hanlon
To: mathgroup at smc.vnet.net
ReplyTo: hanlonr at cox.net
Sent: Apr 27, 2009 1:16 AM
Subject: [mg99150] [mg99108] Re: [mg99084] MaxValue
Round about way
(-1)^n // ComplexExpand
Cos[Pi*n] + I*Sin[Pi*n]
Simplify[(-1)^n == Cos[n*Pi], Element[n, Integers]]
True
MaxValue[Cos[n*Pi], n]
1
Bob Hanlon
---- BG <galt32 at gmail.com> wrote:
=============
Suppose I want to find supremum of {(-1)^n: n is natural}, MaxValue
just returns the question itself.
if I ask it sup of (1+2)^n, it givs infinity, but max of (1-2)^n it
just returns the question itself.
FindMaximum and FindMinimum also can't handle (-1)^n...how can it be
done then?
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