Nuprl Lemma : dl-or_wf
∀[x1,x:Prop]. (x1 ∨ x ∈ Prop)
Proof
Definitions occuring in Statement :
dl-or: x1 ∨ x,
dl-prop: Prop,
uall: ∀[x:A]. B[x],
member: t ∈ T
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
dl-prop: Prop,
dl-or: x1 ∨ x,
member: t ∈ T,
tuple-type: tuple-type(L),
list_ind: list_ind,
prec-arg-types: prec-arg-types(lbl,p.a[lbl; p];i;lbl),
map: map(f;as),
mrec-spec: mrec-spec(L;lbl;p),
apply-alist: apply-alist(eq;L;x),
dl-Spec: dl-Spec(),
cons: [a / b],
ifthenelse: if b then t else f fi ,
atom-deq: AtomDeq,
eq_atom: x =a y,
pi1: fst(t),
bfalse: ff,
btrue: tt,
pi2: snd(t),
null: null(as),
prec: prec(lbl,p.a[lbl; p];i),
mrec: mrec(L;i),
nil: [],
it: ⋅,
uimplies: b supposing a,
less_than: a < b,
squash: ↓T,
less_than': less_than'(a;b),
length: ||as||,
true: True,
and: P ∧ Q
Lemmas referenced :
mk-prec_wf-mrec,
dl-Spec_wf,
dl-prop_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation_alt,
sqequalRule,
cut,
introduction,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesis,
closedConclusion,
tokenEquality,
independent_pairEquality,
hypothesisEquality,
independent_isectElimination,
independent_pairFormation,
natural_numberEquality,
imageMemberEquality,
baseClosed,
inhabitedIsType,
universeIsType
Latex:
\mforall{}[x1,x:Prop]. (x1 \mvee{} x \mmember{} Prop)
Date html generated:
2019_10_15-AM-11_39_50
Last ObjectModification:
2019_03_26-AM-11_24_33
Theory : dynamic!logic
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