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Mathbox for Richard Penner
Short Studies
Additional work on conditional logical operator
ifpid2g
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ifpid1g
Metamath Proof Explorer
Ascii
Unicode
Theorem
ifpid2g
Description:
Restate wff as conditional logic operator.
(Contributed by
RP
, 20-Apr-2020)
Ref
Expression
Assertion
ifpid2g
⊢
ψ
↔
if-
φ
ψ
χ
↔
ψ
→
φ
∨
χ
∧
χ
→
φ
∨
ψ
Proof
Step
Hyp
Ref
Expression
1
ifpidg
⊢
ψ
↔
if-
φ
ψ
χ
↔
φ
∧
ψ
→
ψ
∧
φ
∧
ψ
→
ψ
∧
χ
→
φ
∨
ψ
∧
ψ
→
φ
∨
χ
2
simpr
⊢
φ
∧
ψ
→
ψ
3
2
2
pm3.2i
⊢
φ
∧
ψ
→
ψ
∧
φ
∧
ψ
→
ψ
4
3
biantrur
⊢
χ
→
φ
∨
ψ
∧
ψ
→
φ
∨
χ
↔
φ
∧
ψ
→
ψ
∧
φ
∧
ψ
→
ψ
∧
χ
→
φ
∨
ψ
∧
ψ
→
φ
∨
χ
5
ancom
⊢
χ
→
φ
∨
ψ
∧
ψ
→
φ
∨
χ
↔
ψ
→
φ
∨
χ
∧
χ
→
φ
∨
ψ
6
1
4
5
3bitr2i
⊢
ψ
↔
if-
φ
ψ
χ
↔
ψ
→
φ
∨
χ
∧
χ
→
φ
∨
ψ