Hi,
there seems to be a bug in the series() implementation. The attached
code causes a segfault.
As log(-x) doesn't depend on the expansion parameter ep, series() should
return log(-x). The bug only occurs, if x is defined as possymbol, so it
might have something to do with the branch cut of the logarithm.
I reproduced the bug with GiNaC 1.6.2 and the current git version.
Regards,
Mario