Nuprl Lemma : squash_not
∀[p:ℙ]. uiff(↓¬p;¬p)
Proof
Definitions occuring in Statement :
uiff: uiff(P;Q),
uall: ∀[x:A]. B[x],
prop: ℙ,
not: ¬A,
squash: ↓T
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
uiff: uiff(P;Q),
and: P ∧ Q,
uimplies: b supposing a,
not: ¬A,
implies: P ⇒ Q,
false: False,
squash: ↓T,
prop: ℙ
Lemmas referenced :
not_wf,
squash_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
independent_pairFormation,
lambdaFormation,
thin,
sqequalHypSubstitution,
imageElimination,
independent_functionElimination,
hypothesis,
voidElimination,
hypothesisEquality,
sqequalRule,
lambdaEquality,
dependent_functionElimination,
because_Cache,
lemma_by_obid,
isectElimination,
imageMemberEquality,
baseClosed,
productElimination,
independent_pairEquality,
isect_memberEquality,
equalityTransitivity,
equalitySymmetry,
universeEquality
Latex:
\mforall{}[p:\mBbbP{}]. uiff(\mdownarrow{}\mneg{}p;\mneg{}p)
Date html generated:
2016_05_13-PM-03_13_58
Last ObjectModification:
2016_01_06-PM-05_49_52
Theory : core_2
Home
Index