Once the call to sign exits, there should be no facts on the symbol a:
(%i1) (sign(1/a), facts(a)); (%o1) [notequal(a,0)]
(%i2) facts(a); (%o2) []
See:
http://www.math.utexas.edu/pipermail/maxima/2010/022112.html
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See:
http://www.math.utexas.edu/pipermail/maxima/2010/022112.html