Step
*
of Lemma
weak-antecedent-surjection_functionality_wrt_pred_equiv
∀es:EO
∀[P1,P2,Q1,Q2:E ─→ ℙ]. ∀f:{e:E| P1 e} ─→ {e:E| Q1 e} . (P1
⇐⇒ P2
⇒ Q1
⇐⇒ Q2
⇒ (Q1 ←←= f== P1
⇐⇒ Q2 ←←= f== P2))
BY
{ (Unfold `predicate_equivalent` 0
THEN Auto
THEN Try (Complete (Auto))
THEN Try ((RepeatFor 3 (ParallelLast) THEN Try (RepeatFor 3 (ParallelLast))))
THEN ParallelLast⋅
THEN Auto⋅) }
Latex:
\mforall{}es:EO
\mforall{}[P1,P2,Q1,Q2:E {}\mrightarrow{} \mBbbP{}].
\mforall{}f:\{e:E| P1 e\} {}\mrightarrow{} \{e:E| Q1 e\} . (P1 \mLeftarrow{}{}\mRightarrow{} P2 {}\mRightarrow{} Q1 \mLeftarrow{}{}\mRightarrow{} Q2 {}\mRightarrow{} (Q1 \mleftarrow{}\mleftarrow{}= f== P1 \mLeftarrow{}{}\mRightarrow{} Q2 \mleftarrow{}\mleftarrow{}= f== P2))
By
(Unfold `predicate\_equivalent` 0
THEN Auto
THEN Try (Complete (Auto))
THEN Try ((RepeatFor 3 (ParallelLast) THEN Try (RepeatFor 3 (ParallelLast))))
THEN ParallelLast\mcdot{}
THEN Auto\mcdot{})
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