Nuprl Lemma : distributive-lattice-dual-distrib2
∀[L:DistributiveLattice]. ∀[a,b,c:Point(L)]. (b ∧ c ∨ a = b ∨ a ∧ c ∨ a ∈ Point(L))
Proof
Definitions occuring in Statement :
distributive-lattice: DistributiveLattice,
lattice-join: a ∨ b,
lattice-meet: a ∧ b,
lattice-point: Point(l),
uall: ∀[x:A]. B[x],
equal: s = t ∈ T
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
distributive-lattice: DistributiveLattice,
and: P ∧ Q,
lattice-axioms: lattice-axioms(l),
squash: ↓T,
prop: ℙ,
true: True,
subtype_rel: A ⊆r B,
uimplies: b supposing a,
guard: {T},
iff: P ⇐⇒ Q,
rev_implies: P ⇐ Q,
implies: P ⇒ Q
Lemmas referenced :
equal_wf,
squash_wf,
true_wf,
lattice-join_wf,
lattice-meet_wf,
lattice-point_wf,
lattice-structure_wf,
iff_weakening_equal,
distributive-lattice-dual-distrib,
distributive-lattice_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
hypothesisEquality,
sqequalHypSubstitution,
setElimination,
thin,
rename,
productElimination,
applyEquality,
lambdaEquality,
imageElimination,
extract_by_obid,
isectElimination,
equalityTransitivity,
hypothesis,
equalitySymmetry,
universeEquality,
because_Cache,
natural_numberEquality,
sqequalRule,
imageMemberEquality,
baseClosed,
independent_isectElimination,
independent_functionElimination,
isect_memberEquality,
axiomEquality
Latex:
\mforall{}[L:DistributiveLattice]. \mforall{}[a,b,c:Point(L)]. (b \mwedge{} c \mvee{} a = b \mvee{} a \mwedge{} c \mvee{} a)
Date html generated:
2017_10_05-AM-00_31_15
Last ObjectModification:
2017_07_28-AM-09_12_59
Theory : lattices
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