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| Mirrors > Home > MPE Home > Th. List > Mathboxes > termcterm3 | Structured version Visualization version GIF version | ||
| Description: In the category of small categories, a terminal object is equivalent to a terminal category. (Contributed by Zhi Wang, 18-Oct-2025.) |
| Ref | Expression |
|---|---|
| termcterm.e | ⊢ 𝐸 = (CatCat‘𝑈) |
| termcterm3.u | ⊢ (𝜑 → 𝑈 ∈ 𝑉) |
| termcterm3.c | ⊢ (𝜑 → 𝐶 ∈ 𝑈) |
| termcterm3.1 | ⊢ (𝜑 → (SetCat‘1o) ∈ 𝑈) |
| Ref | Expression |
|---|---|
| termcterm3 | ⊢ (𝜑 → (𝐶 ∈ TermCat ↔ 𝐶 ∈ (TermO‘𝐸))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | termcterm.e | . . 3 ⊢ 𝐸 = (CatCat‘𝑈) | |
| 2 | termcterm3.u | . . . 4 ⊢ (𝜑 → 𝑈 ∈ 𝑉) | |
| 3 | 2 | adantr 486 | . . 3 ⊢ ((𝜑 ∧ 𝐶 ∈ TermCat) → 𝑈 ∈ 𝑉) |
| 4 | termcterm3.c | . . . 4 ⊢ (𝜑 → 𝐶 ∈ 𝑈) | |
| 5 | 4 | adantr 486 | . . 3 ⊢ ((𝜑 ∧ 𝐶 ∈ TermCat) → 𝐶 ∈ 𝑈) |
| 6 | simpr 490 | . . 3 ⊢ ((𝜑 ∧ 𝐶 ∈ TermCat) → 𝐶 ∈ TermCat) | |
| 7 | 1, 3, 5, 6 | termcterm 50755 | . 2 ⊢ ((𝜑 ∧ 𝐶 ∈ TermCat) → 𝐶 ∈ (TermO‘𝐸)) |
| 8 | termcterm3.1 | . . . . . 6 ⊢ (𝜑 → (SetCat‘1o) ∈ 𝑈) | |
| 9 | setc1oterm 50733 | . . . . . . 7 ⊢ (SetCat‘1o) ∈ TermCat | |
| 10 | 9 | a1i 11 | . . . . . 6 ⊢ (𝜑 → (SetCat‘1o) ∈ TermCat) |
| 11 | 8, 10 | elind 4096 | . . . . 5 ⊢ (𝜑 → (SetCat‘1o) ∈ (𝑈 ∩ TermCat)) |
| 12 | 11 | ne0d 4287 | . . . 4 ⊢ (𝜑 → (𝑈 ∩ TermCat) ≠ ∅) |
| 13 | 12 | adantr 486 | . . 3 ⊢ ((𝜑 ∧ 𝐶 ∈ (TermO‘𝐸)) → (𝑈 ∩ TermCat) ≠ ∅) |
| 14 | simpr 490 | . . 3 ⊢ ((𝜑 ∧ 𝐶 ∈ (TermO‘𝐸)) → 𝐶 ∈ (TermO‘𝐸)) | |
| 15 | 1, 13, 14 | termcterm2 50756 | . 2 ⊢ ((𝜑 ∧ 𝐶 ∈ (TermO‘𝐸)) → 𝐶 ∈ TermCat) |
| 16 | 7, 15 | impbida 813 | 1 ⊢ (𝜑 → (𝐶 ∈ TermCat ↔ 𝐶 ∈ (TermO‘𝐸))) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1569 ∈ wcel 2144 ≠ wne 2955 ∩ cin 4088 ∅c0 4277 ‘cfv 6541 1oc1o 8474 TermOctermo 18164 SetCatcsetc 18257 CatCatccatc 18280 TermCatctermc 50714 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7753 ax-cnex 11261 ax-resscn 11262 ax-1cn 11263 ax-icn 11264 ax-addcl 11265 ax-addrcl 11266 ax-mulcl 11267 ax-mulrcl 11268 ax-mulcom 11269 ax-addass 11270 ax-mulass 11271 ax-distr 11272 ax-i2m1 11273 ax-1ne0 11274 ax-1rid 11275 ax-rnegex 11276 ax-rrecex 11277 ax-cnre 11278 ax-pre-lttri 11279 ax-pre-lttrn 11280 ax-pre-ltadd 11281 ax-pre-mulgt0 11282 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3848 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7379 df-ov 7425 df-oprab 7426 df-mpo 7427 df-om 7880 df-1st 8003 df-2nd 8004 df-supp 8182 df-frecs 8304 df-wrecs 8335 df-recs 8384 df-rdg 8423 df-1o 8481 df-er 8722 df-map 8854 df-ixp 8931 df-en 8979 df-dom 8980 df-sdom 8981 df-fin 8982 df-pnf 11350 df-mnf 11351 df-xr 11352 df-ltxr 11353 df-le 11354 df-sub 11548 df-neg 11549 df-nn 12341 df-2 12410 df-3 12411 df-4 12412 df-5 12413 df-6 12414 df-7 12415 df-8 12416 df-9 12417 df-n0 12612 df-z 12699 df-dec 12820 df-uz 12971 df-fz 13645 df-struct 17332 df-slot 17367 df-ndx 17379 df-base 17395 df-hom 17459 df-cco 17460 df-cat 17849 df-cid 17850 df-sect 17929 df-inv 17930 df-iso 17931 df-cic 17978 df-func 18040 df-idfu 18041 df-cofu 18042 df-full 18088 df-fth 18089 df-termo 18167 df-setc 18258 df-catc 18281 df-thinc 50660 df-termc 50715 |
| This theorem is used by: (None) |
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