Nuprl Lemma : geo-cong-angle-symm3
∀e:BasicGeometry. ∀x,y,z,a,b,c:Point. (xyz ≅a abc ⇒ zyx ≅a cba)
Proof
Definitions occuring in Statement :
geo-cong-angle: abc ≅a xyz,
basic-geometry: BasicGeometry,
geo-point: Point,
all: ∀x:A. B[x],
implies: P ⇒ Q
Definitions unfolded in proof :
all: ∀x:A. B[x],
implies: P ⇒ Q,
geo-cong-angle: abc ≅a xyz,
and: P ∧ Q,
exists: ∃x:A. B[x],
member: t ∈ T,
uall: ∀[x:A]. B[x],
prop: ℙ,
subtype_rel: A ⊆r B,
guard: {T},
uimplies: b supposing a,
cand: A c∧ B,
basic-geometry: BasicGeometry,
uiff: uiff(P;Q)
Lemmas referenced :
geo-cong-angle_wf,
geo-point_wf,
euclidean-plane-structure-subtype,
euclidean-plane-subtype,
basic-geometry-subtype,
subtype_rel_transitivity,
basic-geometry_wf,
euclidean-plane_wf,
euclidean-plane-structure_wf,
geo-primitives_wf,
geo-sep-sym,
geo-congruent-iff-length,
geo-length-flip,
geo-between_wf,
geo-congruent_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
lambdaFormation_alt,
sqequalHypSubstitution,
productElimination,
thin,
independent_pairFormation,
universeIsType,
cut,
introduction,
extract_by_obid,
isectElimination,
hypothesisEquality,
hypothesis,
inhabitedIsType,
applyEquality,
instantiate,
independent_isectElimination,
sqequalRule,
dependent_functionElimination,
independent_functionElimination,
because_Cache,
dependent_pairFormation_alt,
equalityTransitivity,
equalitySymmetry,
productIsType
Latex:
\mforall{}e:BasicGeometry. \mforall{}x,y,z,a,b,c:Point. (xyz \mcong{}\msuba{} abc {}\mRightarrow{} zyx \mcong{}\msuba{} cba)
Date html generated:
2019_10_16-PM-01_22_34
Last ObjectModification:
2018_11_07-PM-00_53_09
Theory : euclidean!plane!geometry
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