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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 18023 | . 2 ⊢ (𝐼 ∈ (InitO‘𝐶) → 𝐶 ∈ Cat) | |
| 2 | termorcl 18024 | . . 3 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → (oppCat‘𝐶) ∈ Cat) | |
| 3 | eqid 2762 | . . . . . 6 ⊢ (oppCat‘𝐶) = (oppCat‘𝐶) | |
| 4 | eqid 2762 | . . . . . 6 ⊢ (Base‘𝐶) = (Base‘𝐶) | |
| 5 | 3, 4 | oppcbas 17750 | . . . . 5 ⊢ (Base‘𝐶) = (Base‘(oppCat‘𝐶)) |
| 6 | 5 | termoo2 49854 | . . . 4 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → 𝐼 ∈ (Base‘𝐶)) |
| 7 | elfvex 6902 | . . . 4 ⊢ (𝐼 ∈ (Base‘𝐶) → 𝐶 ∈ V) | |
| 8 | id 22 | . . . . 5 ⊢ (𝐶 ∈ V → 𝐶 ∈ V) | |
| 9 | 3, 8 | oppccatb 49637 | . . . 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 259 | . 2 ⊢ (𝐼 ∈ (TermO‘(oppCat‘𝐶)) → 𝐶 ∈ Cat) |
| 12 | 2fveq3 6872 | . . . 4 ⊢ (𝑐 = 𝐶 → (TermO‘(oppCat‘𝑐)) = (TermO‘(oppCat‘𝐶))) | |
| 13 | dfinito2 18036 | . . . 4 ⊢ InitO = (𝑐 ∈ Cat ↦ (TermO‘(oppCat‘𝑐))) | |
| 14 | fvex 6880 | . . . 4 ⊢ (TermO‘(oppCat‘𝐶)) ∈ V | |
| 15 | 12, 13, 14 | fvmpt 6975 | . . 3 ⊢ (𝐶 ∈ Cat → (InitO‘𝐶) = (TermO‘(oppCat‘𝐶))) |
| 16 | 15 | eleq2d 2848 | . 2 ⊢ (𝐶 ∈ Cat → (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ (TermO‘(oppCat‘𝐶)))) |
| 17 | 1, 11, 16 | pm5.21nii 380 | 1 ⊢ (𝐼 ∈ (InitO‘𝐶) ↔ 𝐼 ∈ (TermO‘(oppCat‘𝐶))) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∈ wcel 2142 Vcvv 3454 ‘cfv 6521 Basecbs 17245 Catccat 17696 oppCatcoppc 17743 InitOcinito 18014 TermOctermo 18015 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-rep 5227 ax-sep 5246 ax-nul 5256 ax-pow 5322 ax-pr 5390 ax-un 7718 ax-cnex 11129 ax-resscn 11130 ax-1cn 11131 ax-icn 11132 ax-addcl 11133 ax-addrcl 11134 ax-mulcl 11135 ax-mulrcl 11136 ax-mulcom 11137 ax-addass 11138 ax-mulass 11139 ax-distr 11140 ax-i2m1 11141 ax-1ne0 11142 ax-1rid 11143 ax-rnegex 11144 ax-rrecex 11145 ax-cnre 11146 ax-pre-lttri 11147 ax-pre-lttrn 11148 ax-pre-ltadd 11149 ax-pre-mulgt0 11150 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1099 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-nf 1804 df-sb 2091 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3367 df-reu 3368 df-rab 3415 df-v 3456 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4481 df-pw 4557 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-iun 4951 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-pred 6288 df-ord 6349 df-on 6350 df-lim 6351 df-suc 6352 df-iota 6477 df-fun 6523 df-fn 6524 df-f 6525 df-f1 6526 df-fo 6527 df-f1o 6528 df-fv 6529 df-riota 7353 df-ov 7399 df-oprab 7400 df-mpo 7401 df-om 7847 df-1st 7970 df-2nd 7971 df-tpos 8206 df-frecs 8262 df-wrecs 8293 df-recs 8342 df-rdg 8381 df-er 8678 df-en 8928 df-dom 8929 df-sdom 8930 df-pnf 11218 df-mnf 11219 df-xr 11220 df-ltxr 11221 df-le 11222 df-sub 11416 df-neg 11417 df-nn 12211 df-2 12280 df-3 12281 df-4 12282 df-5 12283 df-6 12284 df-7 12285 df-8 12286 df-9 12287 df-n0 12482 df-z 12569 df-dec 12689 df-sets 17200 df-slot 17218 df-ndx 17230 df-base 17246 df-hom 17310 df-cco 17311 df-cat 17700 df-cid 17701 df-homf 17702 df-comf 17703 df-oppc 17744 df-inito 18017 df-termo 18018 |
| This theorem is referenced by: oppczeroo 49858 |
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