Nuprl Lemma : pscm-ap-presheaf-fst
∀[C:SmallCategory]. ∀[X,Delta:ps_context{j:l}(C)]. ∀[A:{X ⊢ _}]. ∀[B:{X.A ⊢ _}]. ∀[p:{X ⊢ _:Σ A B}].
∀[s:psc_map{j:l}(C; Delta; X)].
((p.1)s = (p)s.1 ∈ {Delta ⊢ _:(A)s})
Proof
Definitions occuring in Statement :
presheaf-fst: p.1,
presheaf-sigma: Σ A B,
psc-adjoin: X.A,
pscm-ap-term: (t)s,
presheaf-term: {X ⊢ _:A},
pscm-ap-type: (AF)s,
presheaf-type: {X ⊢ _},
psc_map: A ⟶ B,
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
Lemmas referenced :
pscm-presheaf-fst,
pscm-ap-term_wf,
presheaf-fst_wf,
psc_map_wf,
presheaf-term_wf,
presheaf-sigma_wf,
presheaf-type_wf,
psc-adjoin_wf,
small-category-cumulativity-2,
ps_context_cumulativity2,
presheaf-type-cumulativity2,
ps_context_wf,
small-category_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation_alt,
sqequalRule,
cut,
introduction,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
Error :memTop,
hypothesis,
hypothesisEquality,
universeIsType,
instantiate,
applyEquality,
because_Cache
Latex:
\mforall{}[C:SmallCategory]. \mforall{}[X,Delta:ps\_context\{j:l\}(C)]. \mforall{}[A:\{X \mvdash{} \_\}]. \mforall{}[B:\{X.A \mvdash{} \_\}]. \mforall{}[p:\{X \mvdash{} \_:\mSigma{} A B\}].
\mforall{}[s:psc\_map\{j:l\}(C; Delta; X)].
((p.1)s = (p)s.1)
Date html generated:
2020_05_20-PM-01_31_47
Last ObjectModification:
2020_04_02-PM-06_29_29
Theory : presheaf!models!of!type!theory
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