com12 - Metamath Proof Explorer com12 - Intuitionistic Logic ExplorerHypothesis Ref Expression com12.1 ⊢(𝜑→(𝜓→𝜒)) Assertion Ref Expression com12 ⊢(𝜓→(𝜑→𝜒)) Proof of Theorem com12 Step Hyp Ref Expression 1 com12.1 ⊢(𝜑→(𝜓→𝜒)) 2 ax-2 ⊢((𝜑→(𝜓→…