Interesting. I did some experiments and it seems that limit(erf(M*x), 
x=inf) returns 1
whenever FriCAS can determine that M > 0. In particular M=a^2 and M=exp(a) 
work,
whereas M=a does not. However, M = abs(a) does not work either.

Now I have some questions:

1) Why does not sqrt(a^2) return abs(a)?

2) Why does not FriCAS know that abs(a) > 0?

3) How can one tell FriCAS that a>0 in the Gaussian integral? 
    In Maxima this is done with assume. Maybe in FriCAS one could use 
predicates.

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