Nuprl Lemma : FormExists_wf2
∀[C:Type]. ∀[a:PZF-Formula(C)]. ∀[x:Atom]. (∃x. a ∈ PZF-Formula(C))
Proof
Definitions occuring in Statement :
PZF-Formula: PZF-Formula(C),
FormExists: ∃var. body,
uall: ∀[x:A]. B[x],
member: t ∈ T,
atom: Atom,
universe: Type
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
PZF-Formula: PZF-Formula(C),
PZF-Form: PZF-Form(C),
and: P ∧ Q,
cand: A c∧ B,
SafeForm: SafeForm(f),
Form_ind: Form_ind,
FormExists: ∃var. body,
prop: ℙ,
not: ¬A,
implies: P ⇒ Q,
false: False,
assert: ↑b,
ifthenelse: if b then t else f fi ,
termForm: termForm(f),
bfalse: ff,
wfForm: wfForm(f),
wfFormAux: wfFormAux(f),
bnot: ¬bb,
band: p ∧b q,
btrue: tt,
squash: ↓T,
uimplies: b supposing a,
iff: P ⇐⇒ Q,
rev_implies: P ⇐ Q,
true: True
Lemmas referenced :
FormExists_wf,
assert_wf,
wfForm_wf,
SafeForm_wf,
termForm_wf,
not_wf,
PZF-Formula_wf,
squash_wf,
true_wf,
bool_wf,
wfFormAux_wf,
iff_imp_equal_bool,
bfalse_wf,
false_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
sqequalHypSubstitution,
setElimination,
thin,
rename,
dependent_set_memberEquality,
productElimination,
extract_by_obid,
isectElimination,
cumulativity,
hypothesisEquality,
hypothesis,
independent_pairFormation,
sqequalRule,
productEquality,
lambdaFormation,
axiomEquality,
equalityTransitivity,
equalitySymmetry,
atomEquality,
isect_memberEquality,
because_Cache,
universeEquality,
hyp_replacement,
applyEquality,
lambdaEquality,
imageElimination,
independent_isectElimination,
voidElimination,
independent_functionElimination,
natural_numberEquality,
imageMemberEquality,
baseClosed
Latex:
\mforall{}[C:Type]. \mforall{}[a:PZF-Formula(C)]. \mforall{}[x:Atom]. (\mexists{}x. a \mmember{} PZF-Formula(C))
Date html generated:
2018_05_21-PM-11_38_25
Last ObjectModification:
2017_10_12-PM-05_18_10
Theory : PZF
Home
Index