Updates:
Cc: [email protected] [email protected]
Comment #7 on issue 1993 by [email protected]: make sign simplification part
of canonicalizing process
http://code.google.com/p/sympy/issues/detail?id=1993
An idea I had about making (1/(1 - t)).subs(t, 1) is that we could have a
function named epsilon_subs (or directed_subs) that does a two-step
substitution:
def esub(e, old, new, dir='+'):
eps = Dummy()
return e.subs([(old, new + (eps if dir == '+' else -eps)),(eps, 0)])
esub(1/(1 - t), t, 1, '+') # -> -oo
esub(1/(1 - t), t, 1, '-') # -> oo
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