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Comment by frozenport | Hacker News Reader

Heres a little incompatibility. The following code is valid Mathematica code, but the on-line parser rejects it

Integrate[Exp[-(x/2)^2],{x,-Infinity,+Infinity}]

This works in both places (just remove the `+`):

    Integrate[Exp[-(x/2)^2],{x,-Infinity,Infinity}]

Both give 2 Sqrt[Pi]

Thats the point :-) In Mathematica the `+` is supported

This is a known issue in Mathics that has been fixed in the upcoming version 0.6 (soon to be released).

Mathics vice dictator here btw.