Nuprl Lemma : tarski-erect-perp-in
∀e:HeytingGeometry. ∀a,b,c:Point.  (c # ba 
⇒ (∃p:Point. (ab  ⊥a pa ∧ p # ab)))
Proof
Definitions occuring in Statement : 
geo-triangle: a # bc
, 
heyting-geometry: HeytingGeometry
, 
geo-perp-in: ab  ⊥x cd
, 
geo-point: Point
, 
all: ∀x:A. B[x]
, 
exists: ∃x:A. B[x]
, 
implies: P 
⇒ Q
, 
and: P ∧ Q
Definitions unfolded in proof : 
heyting-geometry: Error :heyting-geometry, 
or: P ∨ Q
, 
prop: ℙ
, 
uimplies: b supposing a
, 
uall: ∀[x:A]. B[x]
, 
subtype_rel: A ⊆r B
, 
exists: ∃x:A. B[x]
, 
cand: A c∧ B
, 
and: P ∧ Q
, 
guard: {T}
, 
member: t ∈ T
, 
implies: P 
⇒ Q
, 
all: ∀x:A. B[x]
, 
subtract: n - m
, 
cons: [a / b]
, 
select: L[n]
, 
true: True
, 
squash: ↓T
, 
less_than: a < b
, 
not: ¬A
, 
false: False
, 
less_than': less_than'(a;b)
, 
le: A ≤ B
, 
lelt: i ≤ j < k
, 
int_seg: {i..j-}
, 
top: Top
, 
l_all: (∀x∈L.P[x])
, 
geo-colinear-set: geo-colinear-set(e; L)
, 
geo-perp-in: ab  ⊥x cd
Lemmas referenced : 
Error :basic-geo-primitives_wf, 
geo-point_wf, 
Error :geo-triangle_wf, 
geo-sep_wf, 
geo-triangle-property, 
geo-sep-sym, 
Error :basic-geo-structure_wf, 
basic-geometry_wf, 
Error :heyting-geometry_wf, 
subtype_rel_transitivity, 
heyting-geometry-subtype, 
basic-geometry-subtype, 
geo-sep-or, 
geo-triangle-symmetry, 
tarski-perp-in-exists, 
geo-perp-in_wf, 
perp-aux-general-construction, 
geo-colinear_wf, 
lelt_wf, 
false_wf, 
length_of_nil_lemma, 
length_of_cons_lemma, 
geo-colinear-is-colinear-set, 
geo-colinear-same
Rules used in proof : 
rename, 
setElimination, 
unionElimination, 
dependent_set_memberEquality, 
sqequalRule, 
independent_isectElimination, 
isectElimination, 
instantiate, 
applyEquality, 
productElimination, 
hypothesis, 
because_Cache, 
independent_functionElimination, 
hypothesisEquality, 
thin, 
dependent_functionElimination, 
sqequalHypSubstitution, 
extract_by_obid, 
introduction, 
cut, 
lambdaFormation, 
sqequalReflexivity, 
computationStep, 
sqequalTransitivity, 
sqequalSubstitution, 
productEquality, 
dependent_pairFormation, 
independent_pairFormation, 
baseClosed, 
imageMemberEquality, 
natural_numberEquality, 
voidEquality, 
voidElimination, 
isect_memberEquality
Latex:
\mforall{}e:HeytingGeometry.  \mforall{}a,b,c:Point.    (c  \#  ba  {}\mRightarrow{}  (\mexists{}p:Point.  (ab    \mbot{}a  pa  \mwedge{}  p  \#  ab)))
Date html generated:
2017_10_02-PM-07_10_43
Last ObjectModification:
2017_08_08-PM-00_37_13
Theory : euclidean!plane!geometry
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