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| Mirrors > Home > MPE Home > Th. List > Mathboxes > oppctermo | Structured version Visualization version GIF version | ||
| Description: Terminal objects are initial in the opposite category. Comments before Definition 7.4 in [Adamek] p. 102. (Contributed by Zhi Wang, 26-Oct-2025.) |
| Ref | Expression |
|---|---|
| oppctermo | ⊢ (𝐼 ∈ (TermO‘𝐶) ↔ 𝐼 ∈ (InitO‘(oppCat‘𝐶))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | termorcl 18015 | . 2 ⊢ (𝐼 ∈ (TermO‘𝐶) → 𝐶 ∈ Cat) | |
| 2 | initorcl 18014 | . . 3 ⊢ (𝐼 ∈ (InitO‘(oppCat‘𝐶)) → (oppCat‘𝐶) ∈ Cat) | |
| 3 | eqid 2761 | . . . . . 6 ⊢ (oppCat‘𝐶) = (oppCat‘𝐶) | |
| 4 | eqid 2761 | . . . . . 6 ⊢ (Base‘𝐶) = (Base‘𝐶) | |
| 5 | 3, 4 | oppcbas 17741 | . . . . 5 ⊢ (Base‘𝐶) = (Base‘(oppCat‘𝐶)) |
| 6 | 5 | initoo2 49814 | . . . 4 ⊢ (𝐼 ∈ (InitO‘(oppCat‘𝐶)) → 𝐼 ∈ (Base‘𝐶)) |
| 7 | elfvex 6897 | . . . 4 ⊢ (𝐼 ∈ (Base‘𝐶) → 𝐶 ∈ V) | |
| 8 | id 22 | . . . . 5 ⊢ (𝐶 ∈ V → 𝐶 ∈ V) | |
| 9 | 3, 8 | oppccatb 49598 | . . . 4 ⊢ (𝐶 ∈ V → (𝐶 ∈ Cat ↔ (oppCat‘𝐶) ∈ Cat)) |
| 10 | 6, 7, 9 | 3syl 18 | . . 3 ⊢ (𝐼 ∈ (InitO‘(oppCat‘𝐶)) → (𝐶 ∈ Cat ↔ (oppCat‘𝐶) ∈ Cat)) |
| 11 | 2, 10 | mpbird 259 | . 2 ⊢ (𝐼 ∈ (InitO‘(oppCat‘𝐶)) → 𝐶 ∈ Cat) |
| 12 | 2fveq3 6867 | . . . 4 ⊢ (𝑐 = 𝐶 → (InitO‘(oppCat‘𝑐)) = (InitO‘(oppCat‘𝐶))) | |
| 13 | dftermo2 18028 | . . . 4 ⊢ TermO = (𝑐 ∈ Cat ↦ (InitO‘(oppCat‘𝑐))) | |
| 14 | fvex 6875 | . . . 4 ⊢ (InitO‘(oppCat‘𝐶)) ∈ V | |
| 15 | 12, 13, 14 | fvmpt 6970 | . . 3 ⊢ (𝐶 ∈ Cat → (TermO‘𝐶) = (InitO‘(oppCat‘𝐶))) |
| 16 | 15 | eleq2d 2847 | . 2 ⊢ (𝐶 ∈ Cat → (𝐼 ∈ (TermO‘𝐶) ↔ 𝐼 ∈ (InitO‘(oppCat‘𝐶)))) |
| 17 | 1, 11, 16 | pm5.21nii 380 | 1 ⊢ (𝐼 ∈ (TermO‘𝐶) ↔ 𝐼 ∈ (InitO‘(oppCat‘𝐶))) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∈ wcel 2141 Vcvv 3453 ‘cfv 6516 Basecbs 17236 Catccat 17687 oppCatcoppc 17734 InitOcinito 18005 TermOctermo 18006 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5224 ax-sep 5243 ax-nul 5253 ax-pow 5319 ax-pr 5387 ax-un 7713 ax-cnex 11123 ax-resscn 11124 ax-1cn 11125 ax-icn 11126 ax-addcl 11127 ax-addrcl 11128 ax-mulcl 11129 ax-mulrcl 11130 ax-mulcom 11131 ax-addass 11132 ax-mulass 11133 ax-distr 11134 ax-i2m1 11135 ax-1ne0 11136 ax-1rid 11137 ax-rnegex 11138 ax-rrecex 11139 ax-cnre 11140 ax-pre-lttri 11141 ax-pre-lttrn 11142 ax-pre-ltadd 11143 ax-pre-mulgt0 11144 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4580 df-pr 4582 df-op 4586 df-uni 4863 df-iun 4948 df-br 5098 df-opab 5160 df-mpt 5179 df-tr 5205 df-id 5538 df-eprel 5543 df-po 5551 df-so 5552 df-fr 5596 df-we 5598 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-res 5655 df-ima 5656 df-pred 6283 df-ord 6344 df-on 6345 df-lim 6346 df-suc 6347 df-iota 6472 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-fv 6524 df-riota 7348 df-ov 7394 df-oprab 7395 df-mpo 7396 df-om 7842 df-1st 7965 df-2nd 7966 df-tpos 8200 df-frecs 8256 df-wrecs 8287 df-recs 8336 df-rdg 8375 df-er 8672 df-en 8922 df-dom 8923 df-sdom 8924 df-pnf 11212 df-mnf 11213 df-xr 11214 df-ltxr 11215 df-le 11216 df-sub 11410 df-neg 11411 df-nn 12205 df-2 12274 df-3 12275 df-4 12276 df-5 12277 df-6 12278 df-7 12279 df-8 12280 df-9 12281 df-n0 12476 df-z 12563 df-dec 12683 df-sets 17191 df-slot 17209 df-ndx 17221 df-base 17237 df-hom 17301 df-cco 17302 df-cat 17691 df-cid 17692 df-homf 17693 df-comf 17694 df-oppc 17735 df-inito 18008 df-termo 18009 |
| This theorem is referenced by: oppczeroo 49819 termoeu2 49820 termolmd 50252 |
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