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CLASSICAL FIRST-ORDER LOGIC WITH EQUALITY
Propositional calculus
Logical conjunction
simplbi2comt
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simplbi2com
Metamath Proof Explorer
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Theorem
simplbi2comt
Description:
Closed form of
simplbi2com
.
(Contributed by
Alan Sare
, 22-Jul-2012)
Ref
Expression
Assertion
simplbi2comt
⊢
φ
↔
ψ
∧
χ
→
χ
→
ψ
→
φ
Proof
Step
Hyp
Ref
Expression
1
biimpr
⊢
φ
↔
ψ
∧
χ
→
ψ
∧
χ
→
φ
2
1
expcomd
⊢
φ
↔
ψ
∧
χ
→
χ
→
ψ
→
φ