Step
*
of Lemma
polymorphic-constant-base
∀[T:Type]. ∀f:Base ⟶ T. ∃t:T. ∀x:Base. ((f x) = t ∈ T) supposing mono(T) ∧ value-type(T)
BY
{ (Auto THEN (With ⌜f ⊥⌝ (D 0)⋅ THENA Auto)) }
1
1. [T] : Type
2. mono(T)
3. value-type(T)
4. f : Base ⟶ T
⊢ ∀x:Base. ((f x) = (f ⊥) ∈ T)
Latex:
Latex:
\mforall{}[T:Type]. \mforall{}f:Base {}\mrightarrow{} T. \mexists{}t:T. \mforall{}x:Base. ((f x) = t) supposing mono(T) \mwedge{} value-type(T)
By
Latex:
(Auto THEN (With \mkleeneopen{}f \mbot{}\mkleeneclose{} (D 0)\mcdot{} THENA Auto))
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