Nuprl Lemma : cat-epic_wf
∀[C:SmallCategory]. ∀[x,y:cat-ob(C)]. ∀[f:cat-arrow(C) x y]. (epic(f) ∈ ℙ)
Proof
Definitions occuring in Statement :
cat-epic: epic(f),
cat-arrow: cat-arrow(C),
cat-ob: cat-ob(C),
small-category: SmallCategory,
uall: ∀[x:A]. B[x],
prop: ℙ,
member: t ∈ T,
apply: f a
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
cat-epic: epic(f),
so_lambda: λ2x.t[x],
uimplies: b supposing a,
prop: ℙ,
so_apply: x[s]
Lemmas referenced :
uall_wf,
cat-ob_wf,
cat-arrow_wf,
isect_wf,
equal_wf,
cat-comp_wf,
small-category_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
sqequalRule,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesisEquality,
hypothesis,
lambdaEquality,
applyEquality,
because_Cache,
axiomEquality,
equalityTransitivity,
equalitySymmetry,
isect_memberEquality
Latex:
\mforall{}[C:SmallCategory]. \mforall{}[x,y:cat-ob(C)]. \mforall{}[f:cat-arrow(C) x y]. (epic(f) \mmember{} \mBbbP{})
Date html generated:
2020_05_20-AM-07_50_29
Last ObjectModification:
2017_07_28-AM-09_19_09
Theory : small!categories
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