Step
*
of Lemma
Wzero-leq
∀[A:Type]. ∀[B:A ⟶ Type]. ∀w:W(A;a.B[a]). (isZero(w)
⇐⇒ ∀w2:W(A;a.B[a]). (w ≤ w2))
BY
{ (RepeatFor 2 ((D 0 THENA Auto)) THEN UseWInductionLemma THEN ReduceWcmp 0 THEN RepUR ``Wzero Wsup`` 0 THEN Auto) }
1
1. A : Type
2. B : A ⟶ Type
3. a : A@i
4. f : B[a] ⟶ W(A;a.B[a])@i
5. ∀b:B[a]. (isZero(f b)
⇐⇒ ∀w2:W(A;a.B[a]). ((f b) ≤ w2))@i
6. ∀w2:W(A;a.B[a]). ∀x:B[a]. ((f x) < w2)@i
⊢ ¬B[a]
Latex:
Latex:
\mforall{}[A:Type]. \mforall{}[B:A {}\mrightarrow{} Type]. \mforall{}w:W(A;a.B[a]). (isZero(w) \mLeftarrow{}{}\mRightarrow{} \mforall{}w2:W(A;a.B[a]). (w \mleq{} w2))
By
Latex:
(RepeatFor 2 ((D 0 THENA Auto))
THEN UseWInductionLemma
THEN ReduceWcmp 0
THEN RepUR ``Wzero Wsup`` 0
THEN Auto)
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