alphabetical order defies analytical ability

*To*: mathgroup at yoda.physics.unc.edu*Subject*: alphabetical order defies analytical ability*From*: Leaf Turner <tleaf at leaf.lanl.gov>*Date*: Tue, 13 Apr 93 15:01:25 -0600

It seems that the order of symbols defeats the Solve algorithm. If I take a denominator of e-d, Solve fails. If I take the order d-e, Solve works: Solve[a-ArcSin[ x/(e-d)]==0,x] Solve::solex: Solve "can't handle one of the exponents" [sic!]. x Solve[a - ArcSin[------] == 0, x] -d + e Solve[a-ArcSin[ x/(d-e)]==0,x] {{x -> (d - e) Sin[a]}} ---------------------------- Similarly, if I take r1-r2 in the denominator, Solve works. If I take r2-r1 in the denominator, Solve "can't handle one of the exponents" [sic!]. Solve[a-ArcSin[ x/(r1-r2)]==0,x] {{x -> (r1 - r2) Sin[a]}} Solve[a-ArcSin[ x/(r2-r1)]==0,x] Solve::solex: Solve can't handle one of the exponents. x Solve[a - ArcSin[--------] == 0, x] -r1 + r2