Step
*
1
of Lemma
es-causle-retraction-squash
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)
BY
{ (InstLemma `es-causl-swellfnd` [⌈es⌉]⋅ THENA 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
6. SWellFounded((e < e'))
⊢ retraction(T;f)
Latex:
1. es : EO@i'
2. [T] : Type
3. strong-subtype(T;E)
4. f : T {}\mrightarrow{} T@i
5. \mforall{}x:T. f x c\mleq{} x@i
\mvdash{} retraction(T;f)
By
(InstLemma `es-causl-swellfnd` [\mkleeneopen{}es\mkleeneclose{}]\mcdot{} THENA Auto)
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