[GiNaC-list] arithmetic error on concat two expressions

[Doug]

(-1)^2 == 1^2
therefore
(-expr)^2 == expr^2
therefore
(t-exp(x))^2 == (-(t-exp(x))^2 == (exp(x) - t)^2

Do you see it now?


I'm now a little bit confused, cause I'm working for a long time with this problem and I don't see my "thinking error".
If I have an expression eg exp(x), so (t-exp(x))^2 is not the same (exp(x)-t)^2. Sorry I don't see it

Thanks

Phil
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