Re: simplifying expressions
- To: mathgroup at smc.vnet.net
- Subject: [mg20208] Re: [mg20172] simplifying expressions
- From: BobHanlon at aol.com
- Date: Wed, 6 Oct 1999 21:06:27 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Rip, See online help for Rationalize. expr1 = 6t^2 / (4t^2 + 9t^4)^(3/2); expr2 = 6.t^2 / (4t^2 + 9t^4)^1.5; Rationalize[expr1 - expr2] 0 Bob Hanlon In a message dated 10/4/1999 1:42:15 AM, bitbucket at home.com writes: >I'm sure this is an elementary question, and I apologize for that. > >I'm trying to learn Mathematica (3.0) by working my way thru a >differential geometry text which uses it. > >I have worked out the curvature in two ways, for the curve (t^2,t^3,0). >The answer is 6t^2 / speed^3, where speed = (4t^2 + 9t^4)^.5 . > >Unfortunately, one of the Mathematica answers has real numbers and the >other has integers, and Mathematica doesn't get zero when I subtract >one from the other. > >To be more specific, the two numerators are 6. t^2. and 6 t^2, and the >denominators are 1.5 and 3/2 > >How do I find out what's going on? >