RE: Simple equation checking..
- To: mathgroup at smc.vnet.net
- Subject: [mg25661] RE: [mg25625] Simple equation checking..
- From: "David Park" <djmp at earthlink.net>
- Date: Wed, 18 Oct 2000 02:52:31 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Ian, I believe that your hand differentiation is incorrect. If you want to check if two expressions are equal expression1 == expression2//Simplify or expression1 - expression2 == 0 //Simplify will often work. Mathematica gives: E^(I*Pi) == -1 True Check is really an advanced Mathematica programming command for handling errors in complicated calculations and does not apply to simple checking of equations. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ > -----Original Message----- > From: Ian Fan [mailto:ian at v-wave.com] To: mathgroup at smc.vnet.net > > Hi again, thanks for all the help with my last question but now I am stuck > with another problem if anyone would be so kind enough to help. > > I am looking for a way to check equations, for example, the derivative of > ((x^3 - 4x + 3)/x^(4/3) is (5x^(10/3) - 8x^(7/3) - 12x^(1/3))/(3x^(8/3)) > when calculated via hand but is (3x^2 - 4)/x^(4/3) - 4(x^3 - 4x + > 3)/(3x^(7/3)) when put through mathematica. What I would like to do is if > there is any way to equate the two and see if the statement is > true because > obviously it can look like two completely different answers (to a student) > when they are in fact the same. > > Another example would be, is there any way to check if E^(:ii:Pi) = -1 was > true (at least according to the Euler-Moivre equation), using Mathematica? > > I tried using the "Check" command but I don't know what two > arguments there > are (I tried putting in lhs,rhs but I just got the former as an output). > > Thanks in advance, > Ian Fan > > > >