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Theorem zeroo2 50012
Description: A zero object is an object in the base set. (Contributed by Zhi Wang, 23-Oct-2025.)
Hypothesis
Ref Expression
initoo2.b 𝐵 = (Base‘𝐶)
Assertion
Ref Expression
zeroo2 (𝑂 ∈ (ZeroO‘𝐶) → 𝑂𝐵)

Proof of Theorem zeroo2
StepHypRef Expression
1 zeroorcl 18044 . . 3 (𝑂 ∈ (ZeroO‘𝐶) → 𝐶 ∈ Cat)
2 iszeroi 18061 . . . 4 ((𝐶 ∈ Cat ∧ 𝑂 ∈ (ZeroO‘𝐶)) → (𝑂 ∈ (Base‘𝐶) ∧ (𝑂 ∈ (InitO‘𝐶) ∧ 𝑂 ∈ (TermO‘𝐶))))
32simpld 499 . . 3 ((𝐶 ∈ Cat ∧ 𝑂 ∈ (ZeroO‘𝐶)) → 𝑂 ∈ (Base‘𝐶))
41, 3mpancom 700 . 2 (𝑂 ∈ (ZeroO‘𝐶) → 𝑂 ∈ (Base‘𝐶))
5 initoo2.b . 2 𝐵 = (Base‘𝐶)
64, 5eleqtrrdi 2874 1 (𝑂 ∈ (ZeroO‘𝐶) → 𝑂𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 400   = wceq 1570  wcel 2143  cfv 6536  Basecbs 17264  Catccat 17715  InitOcinito 18033  TermOctermo 18034  ZeroOczeroo 18035
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-nul 5269  ax-pr 5404
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-mpt 5193  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-iota 6492  df-fun 6538  df-fv 6544  df-ov 7413  df-inito 18036  df-zeroo 18038
This theorem is referenced by:  oppczeroo  50015
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