Step
*
1
1
2
1
of Lemma
assert-null-base
1. as : Base
2. if as is a pair then ff otherwise ⊥ ~ tt
3. (if as is a pair then ff otherwise ⊥)↓
4. (as)↓
5. ∀a,b:Base. (if as = Ax then a otherwise b ~ b)
⊢ as = [] ∈ Base
BY
{ (FLemma `has-value-implies-dec-ispair-2` [-2] THENA Auto)⋅ }
1
1. as : Base
2. if as is a pair then ff otherwise ⊥ ~ tt
3. (if as is a pair then ff otherwise ⊥)↓
4. (as)↓
5. ∀a,b:Base. (if as = Ax then a otherwise b ~ b)
6. (as ~ <fst(as), snd(as)>) ∨ (∀a,b:Base. (if as is a pair then a otherwise b ~ b))
⊢ as = [] ∈ Base
Latex:
Latex:
1. as : Base
2. if as is a pair then ff otherwise \mbot{} \msim{} tt
3. (if as is a pair then ff otherwise \mbot{})\mdownarrow{}
4. (as)\mdownarrow{}
5. \mforall{}a,b:Base. (if as = Ax then a otherwise b \msim{} b)
\mvdash{} as = []
By
Latex:
(FLemma `has-value-implies-dec-ispair-2` [-2] THENA Auto)\mcdot{}
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