Nuprl Lemma : ps-sigma-unelim-elim-type
∀[C:SmallCategory]. ∀[X:ps_context{j:l}(C)]. ∀[A:{X ⊢ _}]. ∀[B:{X.A ⊢ _}]. ∀[T:{X.Σ A B ⊢ _}].
(((T)SigmaUnElim)SigmaElim = T ∈ {X.Σ A B ⊢ _})
Proof
Definitions occuring in Statement :
sigma-unelim-pscm: SigmaUnElim,
sigma-elim-pscm: SigmaElim,
presheaf-sigma: Σ A B,
psc-adjoin: X.A,
pscm-ap-type: (AF)s,
presheaf-type: {X ⊢ _},
ps_context: __⊢,
uall: ∀[x:A]. B[x],
equal: s = t ∈ T,
small-category: SmallCategory
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
subtype_rel: A ⊆r B,
prop: ℙ,
squash: ↓T,
uimplies: b supposing a,
true: True,
guard: {T},
iff: P ⇐⇒ Q,
and: P ∧ Q,
implies: P ⇒ Q
Lemmas referenced :
ps-sigma-elim-unelim,
pscm-ap-type_wf,
psc-adjoin_wf,
ps_context_cumulativity2,
presheaf-sigma_wf,
presheaf-type-cumulativity2,
presheaf-type_wf,
small-category-cumulativity-2,
ps_context_wf,
small-category_wf,
equal_wf,
squash_wf,
true_wf,
istype-universe,
pscm-ap-comp-type,
sigma-elim-pscm_wf,
sigma-unelim-pscm_wf,
pscm-ap-type-is-id,
subtype_rel_self,
iff_weakening_equal
Rules used in proof :
cut,
introduction,
extract_by_obid,
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation_alt,
hypothesis,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesisEquality,
applyLambdaEquality,
instantiate,
applyEquality,
because_Cache,
sqequalRule,
universeIsType,
hyp_replacement,
equalitySymmetry,
lambdaEquality_alt,
imageElimination,
equalityTransitivity,
universeEquality,
independent_isectElimination,
natural_numberEquality,
imageMemberEquality,
baseClosed,
productElimination,
independent_functionElimination
Latex:
\mforall{}[C:SmallCategory]. \mforall{}[X:ps\_context\{j:l\}(C)]. \mforall{}[A:\{X \mvdash{} \_\}]. \mforall{}[B:\{X.A \mvdash{} \_\}]. \mforall{}[T:\{X.\mSigma{} A B \mvdash{} \_\}].
(((T)SigmaUnElim)SigmaElim = T)
Date html generated:
2020_05_20-PM-01_32_49
Last ObjectModification:
2020_04_02-PM-07_04_54
Theory : presheaf!models!of!type!theory
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