Nuprl Lemma : geo-left-out-better
∀e:EuclideanPlane. ∀a,b,a',p:Point. (p leftof ba ⇒ b # a' ⇒ (¬((¬B(baa')) ∧ (¬B(ba'a)))) ⇒ p leftof ba')
Proof
Definitions occuring in Statement :
euclidean-plane: EuclideanPlane,
geo-between: B(abc),
geo-left: a leftof bc,
geo-sep: a # b,
geo-point: Point,
all: ∀x:A. B[x],
not: ¬A,
implies: P ⇒ Q,
and: P ∧ Q
Definitions unfolded in proof :
all: ∀x:A. B[x],
implies: P ⇒ Q,
geo-lsep: a # bc,
or: P ∨ Q,
member: t ∈ T,
uall: ∀[x:A]. B[x],
subtype_rel: A ⊆r B,
prop: ℙ,
geo-colinear: Colinear(a;b;c),
not: ¬A,
and: P ∧ Q,
cand: A c∧ B,
uimplies: b supposing a,
geo-colinear-set: geo-colinear-set(e; L),
l_all: (∀x∈L.P[x]),
int_seg: {i..j-},
lelt: i ≤ j < k,
decidable: Dec(P),
satisfiable_int_formula: satisfiable_int_formula(fmla),
exists: ∃x:A. B[x],
false: False,
select: L[n],
cons: [a / b],
subtract: n - m,
guard: {T},
iff: P ⇐⇒ Q
Latex:
\mforall{}e:EuclideanPlane. \mforall{}a,b,a',p:Point.
(p leftof ba {}\mRightarrow{} b \# a' {}\mRightarrow{} (\mneg{}((\mneg{}B(baa')) \mwedge{} (\mneg{}B(ba'a)))) {}\mRightarrow{} p leftof ba')
Date html generated:
2020_05_20-AM-09_56_11
Last ObjectModification:
2019_12_23-PM-08_44_39
Theory : euclidean!plane!geometry
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