Nuprl Lemma : uimplies_functionality_wrt_uiff3
∀[P,Q1,Q2:ℙ]. (Dec(P) ⇒ {uiff(Q1;Q2)} ⇒ {uiff(P supposing Q1;P supposing Q2)})
Proof
Definitions occuring in Statement :
decidable: Dec(P),
uiff: uiff(P;Q),
uimplies: b supposing a,
uall: ∀[x:A]. B[x],
prop: ℙ,
guard: {T},
implies: P ⇒ Q
Definitions unfolded in proof :
guard: {T},
uall: ∀[x:A]. B[x],
implies: P ⇒ Q,
uiff: uiff(P;Q),
and: P ∧ Q,
uimplies: b supposing a,
decidable: Dec(P),
or: P ∨ Q,
false: False,
not: ¬A,
prop: ℙ,
member: t ∈ T
Lemmas referenced :
uiff_wf,
decidable_wf
Rules used in proof :
sqequalSubstitution,
sqequalRule,
sqequalReflexivity,
sqequalTransitivity,
computationStep,
Error :isect_memberFormation_alt,
lambdaFormation,
sqequalHypSubstitution,
productElimination,
thin,
independent_pairFormation,
independent_isectElimination,
hypothesis,
unionElimination,
cut,
independent_functionElimination,
voidElimination,
Error :universeIsType,
hypothesisEquality,
Error :isectIsType,
because_Cache,
introduction,
extract_by_obid,
isectElimination,
Error :inhabitedIsType,
universeEquality
Latex:
\mforall{}[P,Q1,Q2:\mBbbP{}]. (Dec(P) {}\mRightarrow{} \{uiff(Q1;Q2)\} {}\mRightarrow{} \{uiff(P supposing Q1;P supposing Q2)\})
Date html generated:
2019_06_20-AM-11_17_34
Last ObjectModification:
2018_09_26-AM-10_24_55
Theory : core_2
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