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Existence of a limit

How does one (i.e. automatically in an own program) recognize existence of a limit?

So far I've discovered that -oo, oo, ind, und cause the non-existence, I just dunno how to test these "values". Obvious

if limit(f, x=oo, dir='+') == und:

does not work...

Sage 5.1 Kubuntu 12.04