How to get an optimal simplification?

*To*: mathgroup at smc.vnet.net*Subject*: [mg89407] How to get an optimal simplification?*From*: yaqi <yaqiwang at gmail.com>*Date*: Mon, 9 Jun 2008 02:25:29 -0400 (EDT)

Hi, I expected to get: {t1,t2,t3} with the expression: Simplify[{a - b, b - c, c - a}, {t1 == a - b, t2 == b - c, t3 == c - a}] But I only get {-t2-t3,t2,t3}, which is a little bit annoying. I know I can do the simplifications separately like, Simplify[Simplify[Simplify[{a - b, b - c, c - a}, t1 == a - b], t2 == b - c], t3 == c - a] But I still like to get the optimal result with one simplify operation. Is there an answer? (the answer is useful for one of my big derivations.) Thanks

**Follow-Ups**:**Re: How to get an optimal simplification?***From:*"Szabolcs HorvÃt" <szhorvat@gmail.com>