Metamath Proof Explorer

Theorem 3impexpbicomVD

Description: Virtual deduction proof of 3impexpbicom . The following user's proof is completed by invoking mmj2's unify command and using mmj2's StepSelector to pick all remaining steps of the Metamath proof.

1:: |- (. ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) ->. ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) ).
2:: |- ( ( th <-> ta ) <-> ( ta <-> th ) )
3:1,2,?: e10 |- (. ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) ->. ( ( ph /\ ps /\ ch ) -> ( ta <-> th ) ) ).
4:3,?: e1a |- (. ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) ->. ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) ).
5:4: |- ( ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) -> ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) )
6:: |- (. ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) ->. ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) ).
7:6,?: e1a |- (. ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) ->. ( ( ph /\ ps /\ ch ) -> ( ta <-> th ) ) ).
8:7,2,?: e10 |- (. ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) ->. ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) ).
9:8: |- ( ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) -> ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) )
qed:5,9,?: e00 |- ( ( ( ph /\ ps /\ ch ) -> ( th <-> ta ) ) <-> ( ph -> ( ps -> ( ch -> ( ta <-> th ) ) ) ) )
(Contributed by Alan Sare, 31-Dec-2011) (Proof modification is discouraged.) (New usage is discouraged.)

Ref Expression
Assertion 3impexpbicomVD ⊢ φ ∧ ψ ∧ χ → θ ↔ τ ↔ φ → ψ → χ → τ ↔ θ

Proof

Step Hyp Ref Expression
1 idn1 ⊢ φ ∧ ψ ∧ χ → θ ↔ τ → φ ∧ ψ ∧ χ → θ ↔ τ
2 bicom ⊢ θ ↔ τ ↔ τ ↔ θ
3 imbi2 ⊢ θ ↔ τ ↔ τ ↔ θ → φ ∧ ψ ∧ χ → θ ↔ τ ↔ φ ∧ ψ ∧ χ → τ ↔ θ
4 3 biimpcd ⊢ φ ∧ ψ ∧ χ → θ ↔ τ → θ ↔ τ ↔ τ ↔ θ → φ ∧ ψ ∧ χ → τ ↔ θ
5 1 2 4 e10 ⊢ φ ∧ ψ ∧ χ → θ ↔ τ → φ ∧ ψ ∧ χ → τ ↔ θ
6 3impexp ⊢ φ ∧ ψ ∧ χ → τ ↔ θ ↔ φ → ψ → χ → τ ↔ θ
7 6 biimpi ⊢ φ ∧ ψ ∧ χ → τ ↔ θ → φ → ψ → χ → τ ↔ θ
8 5 7 e1a ⊢ φ ∧ ψ ∧ χ → θ ↔ τ → φ → ψ → χ → τ ↔ θ
9 8 in1 ⊢ φ ∧ ψ ∧ χ → θ ↔ τ → φ → ψ → χ → τ ↔ θ
10 idn1 ⊢ φ → ψ → χ → τ ↔ θ → φ → ψ → χ → τ ↔ θ
11 6 biimpri ⊢ φ → ψ → χ → τ ↔ θ → φ ∧ ψ ∧ χ → τ ↔ θ
12 10 11 e1a ⊢ φ → ψ → χ → τ ↔ θ → φ ∧ ψ ∧ χ → τ ↔ θ
13 3 biimprcd ⊢ φ ∧ ψ ∧ χ → τ ↔ θ → θ ↔ τ ↔ τ ↔ θ → φ ∧ ψ ∧ χ → θ ↔ τ
14 12 2 13 e10 ⊢ φ → ψ → χ → τ ↔ θ → φ ∧ ψ ∧ χ → θ ↔ τ
15 14 in1 ⊢ φ → ψ → χ → τ ↔ θ → φ ∧ ψ ∧ χ → θ ↔ τ
16 impbi ⊢ φ ∧ ψ ∧ χ → θ ↔ τ → φ → ψ → χ → τ ↔ θ → φ → ψ → χ → τ ↔ θ → φ ∧ ψ ∧ χ → θ ↔ τ → φ ∧ ψ ∧ χ → θ ↔ τ ↔ φ → ψ → χ → τ ↔ θ
17 9 15 16 e00 ⊢ φ ∧ ψ ∧ χ → θ ↔ τ ↔ φ → ψ → χ → τ ↔ θ