[Maxima] limit of erfc

[Raymond Toy]

I noticed when running just the rtest_gamma test, I get two failures:
limit(erfc(z),z,inf) and limit(erfc(z),z,minf).  This doesn't happen when I
run the entire testsuite.  I guess something is leaking into rtest_gamma
from earlier tests.

However, from a fresh maxima session, maxima cannot determine
limit(erfc(z),z,inf).  But maxima knows limit(erf(z),z,inf) = 1.

Also, erf(inf) -> 1, erfc(inf) -> 0, erf(minf) -> -1, erfc(minf) -> 2.  Why
is that?  Compare what happens with tanh(inf) which just returns the noun
form.  Also, sinh(inf) -> sinh(inf).

It seems a bug that maxima does not know what limit(erfc(z),z,inf) is.

But what about erf(inf) -> 1 instead of a noun form?

Ray
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