Step
*
of Lemma
fix-connected
∀[T:Type]. ∀[eq:EqDecider(T)]. ∀[f:T ⟶ T].
∀[x,y:T]. f**(x) = f**(y) ∈ T supposing x is f*(y) supposing retraction(T;f)
BY
{ xxx(Auto THEN RepeatFor 3 (MoveToConcl (-1)))xxx }
1
1. T : Type
2. eq : EqDecider(T)
3. f : T ⟶ T
4. retraction(T;f)
⊢ ∀x,y:T. (x is f*(y)
⇒ (f**(x) = f**(y) ∈ T))
Latex:
Latex:
\mforall{}[T:Type]. \mforall{}[eq:EqDecider(T)]. \mforall{}[f:T {}\mrightarrow{} T].
\mforall{}[x,y:T]. f**(x) = f**(y) supposing x is f*(y) supposing retraction(T;f)
By
Latex:
xxx(Auto THEN RepeatFor 3 (MoveToConcl (-1)))xxx
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