Nuprl Lemma : disjoint-union-classrel-ite
∀[Info,A,B:Type]. ∀[X:EClass(A)]. ∀[Y:EClass(B)]. ∀[es:EO+(Info)]. ∀[e:E]. ∀[v:A + B].
uiff(v ∈ X + Y(e);↓((↑isl(v)) ∧ outl(v) ∈ X(e)) ∨ ((¬↑isl(v)) ∧ outr(v) ∈ Y(e) ∧ (∀w:A. (¬w ∈ X(e)))))
Proof
Definitions occuring in Statement :
disjoint-union-class: X + Y,
classrel: v ∈ X(e),
eclass: EClass(A[eo; e]),
event-ordering+: EO+(Info),
es-E: E,
outr: outr(x),
outl: outl(x),
assert: ↑b,
isl: isl(x),
uiff: uiff(P;Q),
uall: ∀[x:A]. B[x],
all: ∀x:A. B[x],
not: ¬A,
squash: ↓T,
or: P ∨ Q,
and: P ∧ Q,
union: left + right,
universe: Type
Lemmas :
classrel_wf,
disjoint-union-class_wf,
squash_wf,
or_wf,
assert_wf,
isl_wf,
not_wf,
not_assert_elim,
btrue_wf,
btrue_neq_bfalse,
all_wf,
es-E_wf,
event-ordering+_subtype,
event-ordering+_wf,
eclass_wf,
true_wf,
false_wf,
iff_weakening_uiff,
disjoint-union-classrel,
uiff_wf
Latex:
\mforall{}[Info,A,B:Type]. \mforall{}[X:EClass(A)]. \mforall{}[Y:EClass(B)]. \mforall{}[es:EO+(Info)]. \mforall{}[e:E]. \mforall{}[v:A + B].
uiff(v \mmember{} X + Y(e);\mdownarrow{}((\muparrow{}isl(v)) \mwedge{} outl(v) \mmember{} X(e))
\mvee{} ((\mneg{}\muparrow{}isl(v)) \mwedge{} outr(v) \mmember{} Y(e) \mwedge{} (\mforall{}w:A. (\mneg{}w \mmember{} X(e)))))
Date html generated:
2015_07_22-PM-00_14_26
Last ObjectModification:
2015_01_28-AM-10_46_19
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