From: Eduardo Tabacman <eduardot@dessci.com>

Date: Tue, 8 Jul 2003 08:22:56 -0700

Message-ID: <46566A3075DDD311969100E0811031EC01583141@euclid.dessci>

To: Ana Skupch <anaskupch@cecilija.zesoi.fer.hr>

Cc: www-math@w3.org

Date: Tue, 8 Jul 2003 08:22:56 -0700

Message-ID: <46566A3075DDD311969100E0811031EC01583141@euclid.dessci>

To: Ana Skupch <anaskupch@cecilija.zesoi.fer.hr>

Cc: www-math@w3.org

Hello, > The program I'm working on, should be able for example to > make no difference between "x+2" and "x+1+1" and if possible > also between "sin2x" and "2cosxsinx". If all you want is to compare expressions to decide whether they are really the same or not, there is a simple idea that I think is also pretty useful: It shouldn't be too hard to implement a numerical evaluation of the expression at some points (since it is content markup.) Then you can evaluate the expressions at many points, and compare the results. Almost anything you can write is analytic, so if they agree on many points, chances are they are the same function. Since you are using WebEQ controls already, I should mention that there is now a "Comparator" one that implements what I described. But, again, you can also implement your own to make sure it fits your needs. Regards, Eduardo Tabacman Design ScienceReceived on Tuesday, 8 July 2003 11:22:59 UTC

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