Nuprl Lemma : squash-assert
∀[b:𝔹]. uiff(↓↑b;↑b)
Proof
Definitions occuring in Statement :
assert: ↑b,
bool: 𝔹,
uiff: uiff(P;Q),
uall: ∀[x:A]. B[x],
squash: ↓T
Definitions unfolded in proof :
assert: ↑b,
uall: ∀[x:A]. B[x],
member: t ∈ T,
all: ∀x:A. B[x],
implies: P ⇒ Q,
bool: 𝔹,
unit: Unit,
it: ⋅,
btrue: tt,
uiff: uiff(P;Q),
and: P ∧ Q,
uimplies: b supposing a,
ifthenelse: if b then t else f fi ,
true: True,
prop: ℙ,
squash: ↓T,
bfalse: ff,
exists: ∃x:A. B[x],
or: P ∨ Q,
sq_type: SQType(T),
guard: {T},
bnot: ¬bb,
false: False
Lemmas referenced :
bool_wf,
eqtt_to_assert,
squash_wf,
true_wf,
eqff_to_assert,
equal_wf,
bool_cases_sqequal,
subtype_base_sq,
bool_subtype_base,
assert-bnot,
false_wf,
ifthenelse_wf
Rules used in proof :
sqequalSubstitution,
sqequalRule,
sqequalReflexivity,
sqequalTransitivity,
computationStep,
isect_memberFormation,
introduction,
cut,
hypothesisEquality,
thin,
extract_by_obid,
hypothesis,
lambdaFormation,
sqequalHypSubstitution,
unionElimination,
equalityElimination,
isectElimination,
productElimination,
independent_isectElimination,
independent_pairFormation,
natural_numberEquality,
axiomEquality,
equalityTransitivity,
equalitySymmetry,
imageMemberEquality,
baseClosed,
imageElimination,
dependent_pairFormation,
promote_hyp,
dependent_functionElimination,
instantiate,
cumulativity,
independent_functionElimination,
because_Cache,
voidElimination,
independent_pairEquality,
isect_memberEquality,
universeEquality
Latex:
\mforall{}[b:\mBbbB{}]. uiff(\mdownarrow{}\muparrow{}b;\muparrow{}b)
Date html generated:
2017_10_01-AM-09_11_02
Last ObjectModification:
2017_07_26-PM-04_47_15
Theory : general
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