Nuprl Lemma : geo-add-length-implies-eq2
∀[e:BasicGeometry]. ∀[x:Length]. ∀[a,b:Point]. a ≡ b supposing x = x + |ab| + |ab| ∈ Length
Proof
Definitions occuring in Statement :
geo-add-length: p + q,
geo-length: |s|,
geo-length-type: Length,
geo-mk-seg: ab,
basic-geometry: BasicGeometry,
geo-eq: a ≡ b,
geo-point: Point,
uimplies: b supposing a,
uall: ∀[x:A]. B[x],
equal: s = t ∈ T
Definitions unfolded in proof :
prop: ℙ,
guard: {T},
subtype_rel: A ⊆r B,
false: False,
implies: P ⇒ Q,
not: ¬A,
geo-eq: a ≡ b,
basic-geometry: BasicGeometry,
uimplies: b supposing a,
member: t ∈ T,
uall: ∀[x:A]. B[x],
and: P ∧ Q,
iff: P ⇐⇒ Q,
all: ∀x:A. B[x]
Lemmas referenced :
geo-point_wf,
geo-length-type_wf,
equal_wf,
Error :basic-geo-primitives_wf,
Error :basic-geo-structure_wf,
basic-geometry_wf,
subtype_rel_transitivity,
basic-geometry-subtype,
geo-sep_wf,
geo-mk-seg_wf,
geo-length_wf,
geo-add-length_wf,
geo-add-length-implies-eq-zero,
geo-zero-length-iff,
geo-add-length-is-zero
Rules used in proof :
voidElimination,
equalitySymmetry,
equalityTransitivity,
isect_memberEquality,
instantiate,
applyEquality,
dependent_functionElimination,
lambdaEquality,
sqequalRule,
independent_isectElimination,
hypothesis,
because_Cache,
rename,
setElimination,
hypothesisEquality,
thin,
isectElimination,
sqequalHypSubstitution,
extract_by_obid,
cut,
introduction,
isect_memberFormation,
sqequalReflexivity,
computationStep,
sqequalTransitivity,
sqequalSubstitution,
independent_functionElimination,
productElimination
Latex:
\mforall{}[e:BasicGeometry]. \mforall{}[x:Length]. \mforall{}[a,b:Point]. a \mequiv{} b supposing x = x + |ab| + |ab|
Date html generated:
2017_10_02-PM-06_14_51
Last ObjectModification:
2017_08_05-PM-04_11_28
Theory : euclidean!plane!geometry
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