Authors: Colin James III
These examples were found not tautologous: (∀x,px→r)↔(∃x,px)→r; (∃x,px→r)↔(∀x,px)→r; (∃x,r→px)↔(r→∃x,px). Hence Lean prover from Microsoft is not bivalent and refuted.
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[v1] 2018-08-07 15:06:59
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