Step
*
of Lemma
es-causle-retraction-squash
∀es:EO. ∀[T:Type]. ∀f:T ⟶ T. ((∀x:T. f x c≤ x)
⇒ retraction(T;f)) supposing strong-subtype(T;E)
BY
{ (Auto THEN Try ((DoSubsume THEN Auto))) }
1
1. es : EO@i'
2. [T] : Type
3. strong-subtype(T;E)
4. f : T ⟶ T@i
5. ∀x:T. f x c≤ x@i
⊢ retraction(T;f)
Latex:
Latex:
\mforall{}es:EO. \mforall{}[T:Type]. \mforall{}f:T {}\mrightarrow{} T. ((\mforall{}x:T. f x c\mleq{} x) {}\mRightarrow{} retraction(T;f)) supposing strong-subtype(T;E)
By
Latex:
(Auto THEN Try ((DoSubsume THEN Auto)))
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