Step
*
1
of Lemma
least-equiv-cases2
1. [A] : Type
2. [R] : A ⟶ A ⟶ ℙ
3. a : A
4. b : A
5. a = b ∈ A
⊢ (a = b ∈ A) ∨ ((R a b) ∨ (R b a)) ∨ (∃c:A. (((R a c) ∨ (R c a)) ∧ (least-equiv(A;R) c b)))
BY
{ Auto }
Latex:
Latex:
1. [A] : Type
2. [R] : A {}\mrightarrow{} A {}\mrightarrow{} \mBbbP{}
3. a : A
4. b : A
5. a = b
\mvdash{} (a = b) \mvee{} ((R a b) \mvee{} (R b a)) \mvee{} (\mexists{}c:A. (((R a c) \mvee{} (R c a)) \mwedge{} (least-equiv(A;R) c b)))
By
Latex:
Auto
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