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Currently no, we do not have this. Here are two related things that are also not what you are looking for.

1) Formal proof assistants etc. such as Coq.

2) Proof verifiers in a more informal (though rigorous) sense, such as the open source Lurch.

There are also some 'automatic theorem-discoverers' especially in combinatorics (WZ, or at least I understand it thusly) - for an interesting request for this in Sage, see this CS.SX question.