Nuprl Lemma : pgeo-leq_transitivity
∀g:ProjectivePlane. ∀l,m,n:Line.  (l ≡ m 
⇒ m ≡ n 
⇒ l ≡ n)
Proof
Definitions occuring in Statement : 
projective-plane: ProjectivePlane
, 
pgeo-leq: a ≡ b
, 
pgeo-line: Line
, 
all: ∀x:A. B[x]
, 
implies: P 
⇒ Q
Definitions unfolded in proof : 
uimplies: b supposing a
, 
guard: {T}
, 
subtype_rel: A ⊆r B
, 
uall: ∀[x:A]. B[x]
, 
prop: ℙ
, 
false: False
, 
pgeo-incident: a I b
, 
member: t ∈ T
, 
and: P ∧ Q
, 
exists: ∃x:A. B[x]
, 
pgeo-lsep: l ≠ m
, 
not: ¬A
, 
pgeo-leq: a ≡ b
, 
implies: P 
⇒ Q
, 
all: ∀x:A. B[x]
Lemmas referenced : 
pgeo-line_wf, 
pgeo-primitives_wf, 
projective-plane-structure_wf, 
projective-plane-structure-complete_wf, 
projective-plane_wf, 
subtype_rel_transitivity, 
projective-plane-subtype, 
projective-plane-structure-complete_subtype, 
projective-plane-structure_subtype, 
pgeo-leq_wf, 
pgeo-lsep_wf, 
pgeo-leq-preserves-incidence
Rules used in proof : 
independent_isectElimination, 
instantiate, 
sqequalRule, 
applyEquality, 
isectElimination, 
voidElimination, 
because_Cache, 
hypothesis, 
independent_functionElimination, 
hypothesisEquality, 
dependent_functionElimination, 
extract_by_obid, 
introduction, 
cut, 
thin, 
productElimination, 
sqequalHypSubstitution, 
lambdaFormation, 
sqequalReflexivity, 
computationStep, 
sqequalTransitivity, 
sqequalSubstitution
Latex:
\mforall{}g:ProjectivePlane.  \mforall{}l,m,n:Line.    (l  \mequiv{}  m  {}\mRightarrow{}  m  \mequiv{}  n  {}\mRightarrow{}  l  \mequiv{}  n)
Date html generated:
2018_05_22-PM-00_45_09
Last ObjectModification:
2017_11_28-PM-06_01_25
Theory : euclidean!plane!geometry
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