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Theorem zeroo2 49593
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 17928 . . 3 (𝑂 ∈ (ZeroO‘𝐶) → 𝐶 ∈ Cat)
2 iszeroi 17945 . . . 4 ((𝐶 ∈ Cat ∧ 𝑂 ∈ (ZeroO‘𝐶)) → (𝑂 ∈ (Base‘𝐶) ∧ (𝑂 ∈ (InitO‘𝐶) ∧ 𝑂 ∈ (TermO‘𝐶))))
32simpld 494 . . 3 ((𝐶 ∈ Cat ∧ 𝑂 ∈ (ZeroO‘𝐶)) → 𝑂 ∈ (Base‘𝐶))
41, 3mpancom 689 . 2 (𝑂 ∈ (ZeroO‘𝐶) → 𝑂 ∈ (Base‘𝐶))
5 initoo2.b . 2 𝐵 = (Base‘𝐶)
64, 5eleqtrrdi 2848 1 (𝑂 ∈ (ZeroO‘𝐶) → 𝑂𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1542  wcel 2114  cfv 6500  Basecbs 17148  Catccat 17599  InitOcinito 17917  TermOctermo 17918  ZeroOczeroo 17919
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5243  ax-nul 5253  ax-pr 5379
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-pw 4558  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fv 6508  df-ov 7371  df-inito 17920  df-zeroo 17922
This theorem is referenced by:  oppczeroo  49596
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