I asked Sage to solve the system of the equations:
#
var("pasquare,pbsquare,costhetasquare,Ea,Eb,ma,mb,mc")
assume(Ea>ma)
solution=solve([pasquare*pbsquare*costhetasquare==((-ma^2-mb^2+mc^2)/2
+ Ea*Eb)^2, pasquare==Ea^2-ma^2, pbsquare==Eb^2-
mb^2],pasquare,pbsquare,Eb)
#
But there is the factor sqrt(ma-Ea) in the answer, this factor does
not have sense in case of Ea>ma.
So, assume() does not work with solve().
Is there any way to use assumptions with solve() command?
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