Nuprl Lemma : presheaf-pi-family-comp

C:SmallCategory. ∀X,Delta:ps_context{j:l}(C). ∀s:psc_map{j:l}(C; Delta; X). ∀I,J:cat-ob(C). ∀f:cat-arrow(C) I.
a:Delta(I). ∀A:{X ⊢ _}. ∀B:{X.A ⊢ _}. ∀w:presheaf-pi-family(C; X; A; B; I; (s)a).
  K,g. (w (cat-comp(C) f)) ∈ presheaf-pi-family(C; X; A; B; J; (s)f(a)))


Proof




Definitions occuring in Statement :  presheaf-pi-family: presheaf-pi-family(C; X; A; B; I; a) psc-adjoin: X.A presheaf-type: {X ⊢ _} pscm-ap: (s)x psc_map: A ⟶ B psc-restriction: f(s) I_set: A(I) ps_context: __⊢ all: x:A. B[x] member: t ∈ T apply: a lambda: λx.A[x] cat-comp: cat-comp(C) cat-arrow: cat-arrow(C) cat-ob: cat-ob(C) small-category: SmallCategory
Definitions unfolded in proof :  all: x:A. B[x] member: t ∈ T presheaf-pi-family: presheaf-pi-family(C; X; A; B; I; a) uall: [x:A]. B[x] subtype_rel: A ⊆B so_lambda: λ2x.t[x] so_apply: x[s] uimplies: supposing a squash: T guard: {T} iff: ⇐⇒ Q and: P ∧ Q rev_implies:  Q implies:  Q true: True prop:
Lemmas referenced :  cat-comp_wf subtype_rel_dep_function presheaf-type-at_wf psc-restriction_wf pscm-ap_wf psc-adjoin_wf ps_context_cumulativity2 presheaf-type-cumulativity2 psc-adjoin-set_wf subtype_rel-equal equal_wf I_set_wf pscm-ap-restriction iff_weakening_equal psc-restriction-comp cat-arrow_wf presheaf-type-ap-morph_wf squash_wf true_wf psc-adjoin-set-restriction subtype_rel_self istype-universe presheaf-pi-family_wf small-category-cumulativity-2 presheaf-type_wf cat-ob_wf psc_map_wf ps_context_wf small-category_wf cat-comp-assoc
Rules used in proof :  sqequalSubstitution sqequalTransitivity computationStep sqequalReflexivity lambdaFormation_alt cut sqequalHypSubstitution setElimination thin rename dependent_set_memberEquality_alt lambdaEquality_alt applyEquality hypothesisEquality introduction extract_by_obid isectElimination hypothesis because_Cache sqequalRule instantiate dependent_functionElimination universeIsType independent_isectElimination imageElimination imageMemberEquality baseClosed equalityTransitivity equalitySymmetry productElimination independent_functionElimination natural_numberEquality Error :memTop,  universeEquality functionIsType equalityIstype inhabitedIsType hyp_replacement functionEquality

Latex:
\mforall{}C:SmallCategory.  \mforall{}X,Delta:ps\_context\{j:l\}(C).  \mforall{}s:psc\_map\{j:l\}(C;  Delta;  X).  \mforall{}I,J:cat-ob(C).
\mforall{}f:cat-arrow(C)  J  I.  \mforall{}a:Delta(I).  \mforall{}A:\{X  \mvdash{}  \_\}.  \mforall{}B:\{X.A  \mvdash{}  \_\}.  \mforall{}w:presheaf-pi-family(C;
                                                                                                                                                                    X;
                                                                                                                                                                    A;
                                                                                                                                                                    B;
                                                                                                                                                                    I;
                                                                                                                                                                    (s)a).
    (\mlambda{}K,g.  (w  K  (cat-comp(C)  K  J  I  g  f))  \mmember{}  presheaf-pi-family(C;  X;  A;  B;  J;  (s)f(a)))



Date html generated: 2020_05_20-PM-01_28_49
Last ObjectModification: 2020_04_02-PM-02_00_46

Theory : presheaf!models!of!type!theory


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