Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Assumptions for Trigonometry Inequalities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71328] Assumptions for Trigonometry Inequalities
  • From: Martin Schoenecker <ms_usenet at gmx.de>
  • Date: Wed, 15 Nov 2006 06:43:25 -0500 (EST)
  • Organization: Technische Universitaet Darmstadt

Hello,

the Sin of a real number between zero and Pi should be positive, as 
Simplify finds out, too.

In[133]:= Simplify[Sin[gamma]>0,0<gamma<Pi]
Out[133]= True

As well, the Sin of a number between -Pi and 0 is negative, but why 
doesn't Simplify evaluate it?  The Less implies that the variable is 
real, I think, however stating it explicitly doesn't change the result.

In[134]:= Simplify[Sin[gamma]<0,-Pi<gamma<0]
Out[134]= Sin[gamma]<0

Are there any hints on that?
Thank you,
Martin


  • Prev by Date: coercion into series
  • Next by Date: Re: replacement rule and sparsearray question
  • Previous by thread: Re: Coercion into series
  • Next by thread: Re: Assumptions for Trigonometry Inequalities