Step
*
of Lemma
strict-fun-connected_transitivity3
∀[T:Type]. ∀f:T ⟶ T. (retraction(T;f)
⇒ (∀x,y,z:T. (y = f+(x)
⇒ z is f*(y)
⇒ z = f+(x))))
BY
{ (Unfold `strict-fun-connected` 0 THEN Auto) }
1
1. [T] : Type
2. f : T ⟶ T
3. retraction(T;f)
4. x : T
5. y : T
6. z : T
7. ¬(x = y ∈ T)
8. y is f*(x)
9. z is f*(y)
⊢ ¬(x = z ∈ T)
Latex:
Latex:
\mforall{}[T:Type]. \mforall{}f:T {}\mrightarrow{} T. (retraction(T;f) {}\mRightarrow{} (\mforall{}x,y,z:T. (y = f+(x) {}\mRightarrow{} z is f*(y) {}\mRightarrow{} z = f+(x))))
By
Latex:
(Unfold `strict-fun-connected` 0 THEN Auto)
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