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Usage

Limits in Mathsys have the following syntax: 
lim {var name} -> {expression}{sign?} of ({expression})
like this one 
e == lim n->inf of (1 + 1 / n)^n^

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Signed limits

Signed limits have their expression followed by a sign (either + or -): 
lim x->0+ of (1 / x)
# results in inf

lim x->0- of (1 / x)
# results in -inf

lim x->0 of (1 / x)
# results in undefined