Nuprl Lemma : ispair_wf_listunion
∀[A,B:Type]. ∀[L:Unit ⋃ (A × B)]. (ispair(L) ∈ 𝔹)
Proof
Definitions occuring in Statement :
b-union: A ⋃ B,
bfalse: ff,
btrue: tt,
bool: 𝔹,
uall: ∀[x:A]. B[x],
ispair: if z is a pair then a otherwise b,
unit: Unit,
member: t ∈ T,
product: x:A × B[x],
universe: Type
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
b-union: A ⋃ B,
tunion: ⋃x:A.B[x],
bool: 𝔹,
unit: Unit,
ifthenelse: if b then t else f fi ,
pi2: snd(t)
Lemmas referenced :
bfalse_wf,
btrue_wf,
b-union_wf,
unit_wf2
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
sqequalHypSubstitution,
imageElimination,
productElimination,
thin,
unionElimination,
equalityElimination,
sqequalRule,
lemma_by_obid,
hypothesis,
axiomEquality,
equalityTransitivity,
equalitySymmetry,
isectElimination,
productEquality,
hypothesisEquality,
isect_memberEquality,
because_Cache,
universeEquality
Latex:
\mforall{}[A,B:Type]. \mforall{}[L:Unit \mcup{} (A \mtimes{} B)]. (ispair(L) \mmember{} \mBbbB{})
Date html generated:
2016_05_15-PM-10_09_26
Last ObjectModification:
2015_12_27-PM-05_59_34
Theory : eval!all
Home
Index