Nuprl Lemma : lifting-null-spread
∀[p,F:Top]. (null(let x,y = p in F[x;y]) ~ let x,y = p in null(F[x;y]))
Proof
Definitions occuring in Statement :
null: null(as),
uall: ∀[x:A]. B[x],
top: Top,
so_apply: x[s1;s2],
spread: spread def,
sqequal: s ~ t
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
top: Top,
strict4: strict4(F),
and: P ∧ Q,
all: ∀x:A. B[x],
implies: P ⇒ Q,
null: null(as),
has-value: (a)↓,
prop: ℙ,
guard: {T},
or: P ∨ Q,
squash: ↓T,
so_lambda: so_lambda(x,y,z,w.t[x; y; z; w]),
so_apply: x[s1;s2;s3;s4],
uimplies: b supposing a
Lemmas referenced :
lifting-strict-spread,
is-exception_wf,
base_wf,
has-value_wf_base,
top_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
hypothesis,
sqequalAxiom,
lemma_by_obid,
sqequalRule,
sqequalHypSubstitution,
isect_memberEquality,
isectElimination,
thin,
hypothesisEquality,
because_Cache,
baseClosed,
voidElimination,
voidEquality,
independent_pairFormation,
lambdaFormation,
callbyvalueIspair,
baseApply,
closedConclusion,
ispairExceptionCases,
inrFormation,
imageMemberEquality,
imageElimination,
exceptionSqequal,
inlFormation,
independent_isectElimination
Latex:
\mforall{}[p,F:Top]. (null(let x,y = p in F[x;y]) \msim{} let x,y = p in null(F[x;y]))
Date html generated:
2016_05_15-PM-02_07_19
Last ObjectModification:
2016_01_15-PM-10_24_05
Theory : untyped!computation
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