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| Mirrors > Home > MPE Home > Th. List > Mathboxes > oppcinito | Structured version Visualization version GIF version | ||
| Description: Initial objects are terminal in the opposite category. (Contributed by Zhi Wang, 23-Oct-2025.) |
| Ref | Expression |
|---|---|
| oppcinito | ⊢ (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ (TermO‘(oppCat‘𝐶))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | initorcl 17928 | . 2 ⊢ (𝐼 ∈ (InitO‘𝐶) → 𝐶 ∈ Cat) | |
| 2 | termorcl 17929 | . . 3 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → (oppCat‘𝐶) ∈ Cat) | |
| 3 | eqid 2729 | . . . . . 6 ⊢ (oppCat‘𝐶) = (oppCat‘𝐶) | |
| 4 | eqid 2729 | . . . . . 6 ⊢ (Base‘𝐶) = (Base‘𝐶) | |
| 5 | 3, 4 | oppcbas 17655 | . . . . 5 ⊢ (Base‘𝐶) = (Base‘(oppCat‘𝐶)) |
| 6 | 5 | termoo2 49195 | . . . 4 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → 𝐼 ∈ (Base‘𝐶)) |
| 7 | elfvex 6878 | . . . 4 ⊢ (𝐼 ∈ (Base‘𝐶) → 𝐶 ∈ V) | |
| 8 | id 22 | . . . . 5 ⊢ (𝐶 ∈ V → 𝐶 ∈ V) | |
| 9 | 3, 8 | oppccatb 48978 | . . . 4 ⊢ (𝐶 ∈ V → (𝐶 ∈ Cat ↔ (oppCat‘𝐶) ∈ Cat)) |
| 10 | 6, 7, 9 | 3syl 18 | . . 3 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → (𝐶 ∈ Cat ↔ (oppCat‘𝐶) ∈ Cat)) |
| 11 | 2, 10 | mpbird 257 | . 2 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → 𝐶 ∈ Cat) |
| 12 | 2fveq3 6845 | . . . 4 ⊢ (𝑐 = 𝐶 → (TermO‘(oppCat‘𝑐)) = (TermO‘(oppCat‘𝐶))) | |
| 13 | dfinito2 17941 | . . . 4 ⊢ InitO = (𝑐 ∈ Cat ↦ (TermO‘(oppCat‘𝑐))) | |
| 14 | fvex 6853 | . . . 4 ⊢ (TermO‘(oppCat‘𝐶)) ∈ V | |
| 15 | 12, 13, 14 | fvmpt 6950 | . . 3 ⊢ (𝐶 ∈ Cat → (InitO‘𝐶) = (TermO‘(oppCat‘𝐶))) |
| 16 | 15 | eleq2d 2814 | . 2 ⊢ (𝐶 ∈ Cat → (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ (TermO‘(oppCat‘𝐶)))) |
| 17 | 1, 11, 16 | pm5.21nii 378 | 1 ⊢ (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ (TermO‘(oppCat‘𝐶))) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∈ wcel 2109 Vcvv 3444 ‘cfv 6499 Basecbs 17155 Catccat 17601 oppCatcoppc 17648 InitOcinito 17919 TermOctermo 17920 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5229 ax-sep 5246 ax-nul 5256 ax-pow 5315 ax-pr 5382 ax-un 7691 ax-cnex 11100 ax-resscn 11101 ax-1cn 11102 ax-icn 11103 ax-addcl 11104 ax-addrcl 11105 ax-mulcl 11106 ax-mulrcl 11107 ax-mulcom 11108 ax-addass 11109 ax-mulass 11110 ax-distr 11111 ax-i2m1 11112 ax-1ne0 11113 ax-1rid 11114 ax-rnegex 11115 ax-rrecex 11116 ax-cnre 11117 ax-pre-lttri 11118 ax-pre-lttrn 11119 ax-pre-ltadd 11120 ax-pre-mulgt0 11121 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3351 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-pss 3931 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6262 df-ord 6323 df-on 6324 df-lim 6325 df-suc 6326 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-riota 7326 df-ov 7372 df-oprab 7373 df-mpo 7374 df-om 7823 df-1st 7947 df-2nd 7948 df-tpos 8182 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-er 8648 df-en 8896 df-dom 8897 df-sdom 8898 df-pnf 11186 df-mnf 11187 df-xr 11188 df-ltxr 11189 df-le 11190 df-sub 11383 df-neg 11384 df-nn 12163 df-2 12225 df-3 12226 df-4 12227 df-5 12228 df-6 12229 df-7 12230 df-8 12231 df-9 12232 df-n0 12419 df-z 12506 df-dec 12626 df-sets 17110 df-slot 17128 df-ndx 17140 df-base 17156 df-hom 17220 df-cco 17221 df-cat 17605 df-cid 17606 df-homf 17607 df-comf 17608 df-oppc 17649 df-inito 17922 df-termo 17923 |
| This theorem is referenced by: oppczeroo 49199 |
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