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| Mirrors > Home > MPE Home > Th. List > Mathboxes > zeroo2 | Structured version Visualization version GIF version | ||
| Description: A zero object is an object in the base set. (Contributed by Zhi Wang, 23-Oct-2025.) |
| Ref | Expression |
|---|---|
| initoo2.b | ⊢ 𝐵 = (Base‘𝐶) |
| Ref | Expression |
|---|---|
| zeroo2 | ⊢ (𝑂 ∈ (ZeroO‘𝐶) → 𝑂 ∈ 𝐵) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | zeroorcl 17916 | . . 3 ⊢ (𝑂 ∈ (ZeroO‘𝐶) → 𝐶 ∈ Cat) | |
| 2 | iszeroi 17933 | . . . 4 ⊢ ((𝐶 ∈ Cat ∧ 𝑂 ∈ (ZeroO‘𝐶)) → (𝑂 ∈ (Base‘𝐶) ∧ (𝑂 ∈ (InitO‘𝐶) ∧ 𝑂 ∈ (TermO‘𝐶)))) | |
| 3 | 2 | simpld 494 | . . 3 ⊢ ((𝐶 ∈ Cat ∧ 𝑂 ∈ (ZeroO‘𝐶)) → 𝑂 ∈ (Base‘𝐶)) |
| 4 | 1, 3 | mpancom 688 | . 2 ⊢ (𝑂 ∈ (ZeroO‘𝐶) → 𝑂 ∈ (Base‘𝐶)) |
| 5 | initoo2.b | . 2 ⊢ 𝐵 = (Base‘𝐶) | |
| 6 | 4, 5 | eleqtrrdi 2847 | 1 ⊢ (𝑂 ∈ (ZeroO‘𝐶) → 𝑂 ∈ 𝐵) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ‘cfv 6492 Basecbs 17136 Catccat 17587 InitOcinito 17905 TermOctermo 17906 ZeroOczeroo 17907 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-br 5099 df-opab 5161 df-mpt 5180 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-iota 6448 df-fun 6494 df-fv 6500 df-ov 7361 df-inito 17908 df-zeroo 17910 |
| This theorem is referenced by: oppczeroo 49482 |
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