Nuprl Lemma : l_disjoint_append
∀[T:Type]. ∀[a,b,c:T List].  uiff(l_disjoint(T;a;b @ c);l_disjoint(T;a;b) ∧ l_disjoint(T;a;c))
Proof
Definitions occuring in Statement : 
l_disjoint: l_disjoint(T;l1;l2)
, 
append: as @ bs
, 
list: T List
, 
uiff: uiff(P;Q)
, 
uall: ∀[x:A]. B[x]
, 
and: P ∧ Q
, 
universe: Type
Definitions unfolded in proof : 
l_disjoint: l_disjoint(T;l1;l2)
, 
uiff: uiff(P;Q)
, 
and: P ∧ Q
, 
uimplies: b supposing a
, 
member: t ∈ T
, 
all: ∀x:A. B[x]
, 
not: ¬A
, 
implies: P 
⇒ Q
, 
false: False
, 
cand: A c∧ B
, 
or: P ∨ Q
, 
prop: ℙ
, 
uall: ∀[x:A]. B[x]
, 
guard: {T}
, 
so_lambda: λ2x.t[x]
, 
so_apply: x[s]
, 
iff: P 
⇐⇒ Q
, 
rev_implies: P 
⇐ Q
Lemmas referenced : 
l_member_wf, 
all_wf, 
not_wf, 
or_wf, 
member_append, 
append_wf, 
uiff_wf, 
l_disjoint_wf, 
list_wf
Rules used in proof : 
sqequalSubstitution, 
sqequalTransitivity, 
computationStep, 
sqequalReflexivity, 
cut, 
independent_pairFormation, 
isect_memberFormation, 
introduction, 
lambdaFormation, 
thin, 
hypothesis, 
sqequalHypSubstitution, 
dependent_functionElimination, 
hypothesisEquality, 
productElimination, 
independent_functionElimination, 
inlFormation, 
extract_by_obid, 
isectElimination, 
productEquality, 
voidElimination, 
because_Cache, 
sqequalRule, 
inrFormation, 
independent_pairEquality, 
lambdaEquality, 
addLevel, 
independent_isectElimination, 
cumulativity, 
universeEquality, 
isect_memberEquality, 
equalityTransitivity, 
equalitySymmetry, 
unionElimination
Latex:
\mforall{}[T:Type].  \mforall{}[a,b,c:T  List].    uiff(l\_disjoint(T;a;b  @  c);l\_disjoint(T;a;b)  \mwedge{}  l\_disjoint(T;a;c))
Date html generated:
2019_06_20-PM-01_27_06
Last ObjectModification:
2018_08_24-PM-11_13_00
Theory : list_1
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