Nuprl Lemma : fpf-cap-void-subtype
∀[A:Type]. ∀[eq:EqDecider(A)]. ∀[ds:x:A fp-> Type]. ∀[x:A]. (ds(x)?Void ⊆r ds(x)?Top)
Proof
Definitions occuring in Statement :
fpf-cap: f(x)?z,
fpf: a:A fp-> B[a],
deq: EqDecider(T),
subtype_rel: A ⊆r B,
uall: ∀[x:A]. B[x],
top: Top,
void: Void,
universe: Type
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
fpf-cap: f(x)?z,
subtype_rel: A ⊆r B,
so_lambda: λ2x.t[x],
so_apply: x[s],
uimplies: b supposing a,
all: ∀x:A. B[x],
top: Top,
implies: P ⇒ Q,
bool: 𝔹,
unit: Unit,
it: ⋅,
btrue: tt,
uiff: uiff(P;Q),
and: P ∧ Q,
ifthenelse: if b then t else f fi ,
bfalse: ff,
prop: ℙ
Lemmas referenced :
fpf_wf,
deq_wf,
fpf-dom_wf,
subtype-fpf2,
top_wf,
bool_wf,
subtype_rel_self,
fpf-ap_wf,
equal-wf-T-base,
assert_wf,
bnot_wf,
not_wf,
eqtt_to_assert,
uiff_transitivity,
eqff_to_assert,
assert_of_bnot,
equal_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
sqequalRule,
axiomEquality,
hypothesis,
hypothesisEquality,
sqequalHypSubstitution,
isect_memberEquality,
isectElimination,
thin,
because_Cache,
instantiate,
extract_by_obid,
cumulativity,
lambdaEquality,
universeEquality,
applyEquality,
independent_isectElimination,
lambdaFormation,
voidElimination,
voidEquality,
equalityTransitivity,
equalitySymmetry,
baseClosed,
unionElimination,
equalityElimination,
productElimination,
independent_functionElimination,
dependent_functionElimination
Latex:
\mforall{}[A:Type]. \mforall{}[eq:EqDecider(A)]. \mforall{}[ds:x:A fp-> Type]. \mforall{}[x:A]. (ds(x)?Void \msubseteq{}r ds(x)?Top)
Date html generated:
2018_05_21-PM-09_19_25
Last ObjectModification:
2018_02_09-AM-10_17_34
Theory : finite!partial!functions
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