Nuprl Lemma : geo-gt-implies-point2
∀e:EuclideanPlane. ∀a,b,c,d:Point.  (ab > cd 
⇒ c ≠ d 
⇒ (∃f:Point. (c_d_f ∧ cf ≅ ab)))
Proof
Definitions occuring in Statement : 
euclidean-plane: EuclideanPlane
, 
geo-gt: cd > ab
, 
geo-congruent: ab ≅ cd
, 
geo-between: a_b_c
, 
geo-sep: a ≠ b
, 
geo-point: Point
, 
all: ∀x:A. B[x]
, 
exists: ∃x:A. B[x]
, 
implies: P 
⇒ Q
, 
and: P ∧ Q
Definitions unfolded in proof : 
all: ∀x:A. B[x]
, 
implies: P 
⇒ Q
, 
guard: {T}
, 
member: t ∈ T
, 
basic-geometry: BasicGeometry
, 
euclidean-plane: EuclideanPlane
, 
exists: ∃x:A. B[x]
, 
and: P ∧ Q
, 
subtype_rel: A ⊆r B
, 
uall: ∀[x:A]. B[x]
, 
uimplies: b supposing a
, 
prop: ℙ
, 
cand: A c∧ B
, 
stable: Stable{P}
, 
uiff: uiff(P;Q)
, 
not: ¬A
, 
false: False
, 
iff: P 
⇐⇒ Q
, 
geo-strict-between: a-b-c
Lemmas referenced : 
geo-gt-sep, 
geo-proper-extend-exists, 
geo-O_wf, 
geo-X_wf, 
geo-sep-sym, 
geo-sep-O-X, 
geo-strict-between-sep3, 
euclidean-plane-structure-subtype, 
euclidean-plane-subtype, 
subtype_rel_transitivity, 
euclidean-plane_wf, 
euclidean-plane-structure_wf, 
geo-primitives_wf, 
geo-sep_wf, 
geo-gt_wf, 
geo-point_wf, 
geo-gt-implies-point, 
stable__geo-between, 
double-negation-hyp-elim, 
geo-strict-between_wf, 
geo-congruent_wf, 
not_wf, 
geo-between_wf, 
geo-construction-unicity, 
geo-strict-between-implies-between, 
geo-between-symmetry, 
geo-between-outer-trans, 
geo-congruent-iff-length, 
istype-void, 
geo-congruent_functionality, 
geo-eq_weakening, 
geo-strict-between_functionality
Rules used in proof : 
sqequalSubstitution, 
sqequalTransitivity, 
computationStep, 
sqequalReflexivity, 
lambdaFormation_alt, 
cut, 
introduction, 
extract_by_obid, 
hypothesis, 
thin, 
sqequalHypSubstitution, 
sqequalRule, 
dependent_functionElimination, 
hypothesisEquality, 
independent_functionElimination, 
setElimination, 
rename, 
because_Cache, 
productElimination, 
applyEquality, 
instantiate, 
isectElimination, 
independent_isectElimination, 
universeIsType, 
inhabitedIsType, 
dependent_pairFormation_alt, 
productEquality, 
equalityTransitivity, 
equalitySymmetry, 
productIsType, 
independent_pairFormation, 
functionIsType, 
voidElimination
Latex:
\mforall{}e:EuclideanPlane.  \mforall{}a,b,c,d:Point.    (ab  >  cd  {}\mRightarrow{}  c  \mneq{}  d  {}\mRightarrow{}  (\mexists{}f:Point.  (c\_d\_f  \mwedge{}  cf  \mcong{}  ab)))
Date html generated:
2019_10_16-PM-01_17_22
Last ObjectModification:
2019_08_07-PM-02_53_40
Theory : euclidean!plane!geometry
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