Nuprl Lemma : has-value-ifthenelse-type
∀[a,b,c:Base]. a ∈ Top + Top supposing (if a then b else c fi )↓
Proof
Definitions occuring in Statement :
has-value: (a)↓,
ifthenelse: if b then t else f fi ,
uimplies: b supposing a,
uall: ∀[x:A]. B[x],
top: Top,
member: t ∈ T,
union: left + right,
base: Base
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
uimplies: b supposing a,
ifthenelse: if b then t else f fi ,
has-value: (a)↓,
prop: ℙ
Lemmas referenced :
base_wf,
has-value_wf_base
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
sqequalHypSubstitution,
callbyvalueDecide,
hypothesis,
equalityTransitivity,
equalitySymmetry,
sqequalRule,
axiomEquality,
lemma_by_obid,
isectElimination,
thin,
baseApply,
closedConclusion,
baseClosed,
hypothesisEquality,
isect_memberEquality,
because_Cache
Latex:
\mforall{}[a,b,c:Base]. a \mmember{} Top + Top supposing (if a then b else c fi )\mdownarrow{}
Date html generated:
2016_05_13-PM-03_59_55
Last ObjectModification:
2016_01_14-PM-07_21_17
Theory : bool_1
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