termcterm2 - Mathbox for Zhi Wang

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Theorem termcterm2 49476

Description: A terminal object of the category of small categories is a terminal category. (Contributed by Zhi Wang, 18-Oct-2025.) (Proof shortened by Zhi Wang, 23-Oct-2025.)

**Hypotheses**
Ref	Expression
termcterm.e	⊢ 𝐸 = (CatCat‘𝑈)
termcterm2.	⊢ (𝜑 → (𝑈 ∩ TermCat) ≠ ∅)
termcterm2.t	⊢ (𝜑 → 𝐶 ∈ (TermO‘𝐸))

**Assertion**
Ref	Expression
termcterm2	⊢ (𝜑 → 𝐶 ∈ TermCat)

Proof of Theorem termcterm2 Dummy variables 𝑑 𝑓 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		termcterm2.	. . 3 ⊢ (𝜑 → (𝑈 ∩ TermCat) ≠ ∅)
2		n0 4312	. . 3 ⊢ ((𝑈 ∩ TermCat) ≠ ∅ ↔ ∃𝑑 𝑑 ∈ (𝑈 ∩ TermCat))
3	1, 2	sylib 218	. 2 ⊢ (𝜑 → ∃𝑑 𝑑 ∈ (𝑈 ∩ TermCat))
4		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (𝑈 ∩ TermCat))
5	4	elin2d 4164	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ TermCat)
6	5	termcthind 49440	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ ThinCat)
7		termcterm.e	. . . . 5 ⊢ 𝐸 = (CatCat‘𝑈)
8		eqid 2729	. . . . 5 ⊢ (Base‘𝐸) = (Base‘𝐸)
9		termcterm2.t	. . . . . . . 8 ⊢ (𝜑 → 𝐶 ∈ (TermO‘𝐸))
10	9	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ (TermO‘𝐸))
11	8	termoo2 49195	. . . . . . 7 ⊢ (𝐶 ∈ (TermO‘𝐸) → 𝐶 ∈ (Base‘𝐸))
12	10, 11	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ (Base‘𝐸))
13	7, 8	elbasfv 17161	. . . . . 6 ⊢ (𝐶 ∈ (Base‘𝐸) → 𝑈 ∈ V)
14	12, 13	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑈 ∈ V)
15	4	elin1d 4163	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ 𝑈)
16	5	termccd 49441	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ Cat)
17	15, 16	elind 4159	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (𝑈 ∩ Cat))
18	7, 8, 14	catcbas 18039	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐸) = (𝑈 ∩ Cat))
19	17, 18	eleqtrrd 2831	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (Base‘𝐸))
20		termorcl 17929	. . . . . . 7 ⊢ (𝐶 ∈ (TermO‘𝐸) → 𝐸 ∈ Cat)
21	10, 20	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐸 ∈ Cat)
22	7, 14, 15, 5	termcterm 49475	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (TermO‘𝐸))
23	21, 10, 22	termoeu1w 17957	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶( ≃_𝑐 ‘𝐸)𝑑)
24	7, 8, 14, 12, 19, 23	thincciso4 49419	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝐶 ∈ ThinCat ↔ 𝑑 ∈ ThinCat))
25	6, 24	mpbird 257	. . 3 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ ThinCat)
26	21, 10, 22	termoeu1 17956	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → ∃!𝑓 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑))
27		euex 2570	. . . . . 6 ⊢ (∃!𝑓 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑) → ∃𝑓 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑))
28	26, 27	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → ∃𝑓 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑))
29		eqid 2729	. . . . . . . 8 ⊢ (Base‘𝐶) = (Base‘𝐶)
30		eqid 2729	. . . . . . . 8 ⊢ (Base‘𝑑) = (Base‘𝑑)
31		eqid 2729	. . . . . . . 8 ⊢ (Iso‘𝐸) = (Iso‘𝐸)
32	7, 8, 29, 30, 14, 12, 19, 31	catciso 18049	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝑓 ∈ (𝐶(Iso‘𝐸)𝑑) ↔ (𝑓 ∈ ((𝐶 Full 𝑑) ∩ (𝐶 Faith 𝑑)) ∧ (1^st ‘𝑓):(Base‘𝐶)–1-1-onto→(Base‘𝑑))))
33	32	simplbda 499	. . . . . 6 ⊢ (((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) ∧ 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑)) → (1^st ‘𝑓):(Base‘𝐶)–1-1-onto→(Base‘𝑑))
34		fvex 6853	. . . . . . 7 ⊢ (Base‘𝐶) ∈ V
35	34	f1oen 8921	. . . . . 6 ⊢ ((1^st ‘𝑓):(Base‘𝐶)–1-1-onto→(Base‘𝑑) → (Base‘𝐶) ≈ (Base‘𝑑))
36	33, 35	syl 17	. . . . 5 ⊢ (((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) ∧ 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑)) → (Base‘𝐶) ≈ (Base‘𝑑))
37	28, 36	exlimddv 1935	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐶) ≈ (Base‘𝑑))
38	30	istermc3 49438	. . . . . 6 ⊢ (𝑑 ∈ TermCat ↔ (𝑑 ∈ ThinCat ∧ (Base‘𝑑) ≈ 1_o))
39	5, 38	sylib 218	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝑑 ∈ ThinCat ∧ (Base‘𝑑) ≈ 1_o))
40	39	simprd 495	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝑑) ≈ 1_o)
41		entr 8954	. . . 4 ⊢ (((Base‘𝐶) ≈ (Base‘𝑑) ∧ (Base‘𝑑) ≈ 1_o) → (Base‘𝐶) ≈ 1_o)
42	37, 40, 41	syl2anc 584	. . 3 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐶) ≈ 1_o)
43	29	istermc3 49438	. . 3 ⊢ (𝐶 ∈ TermCat ↔ (𝐶 ∈ ThinCat ∧ (Base‘𝐶) ≈ 1_o))
44	25, 42, 43	sylanbrc 583	. 2 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ TermCat)
45	3, 44	exlimddv 1935	1 ⊢ (𝜑 → 𝐶 ∈ TermCat)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∃wex 1779 ∈ wcel 2109 ∃!weu 2561 ≠ wne 2925 Vcvv 3444 ∩ cin 3910 ∅c0 4292 class class class wbr 5102 –1-1-onto→wf1o 6498 ‘cfv 6499 (class class class)co 7369 1^st c1st 7945 1_oc1o 8404 ≈ cen 8892 Basecbs 17155 Catccat 17601 Isociso 17684 Full cful 17842 Faith cfth 17843 TermOctermo 17920 CatCatccatc 18036 ThinCatcthinc 49379 TermCatctermc 49434

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-tp 4590 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-supp 8117 df-frecs 8237 df-wrecs 8268 df-recs 8317 df-rdg 8355 df-1o 8411 df-er 8648 df-map 8778 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 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-uz 12770 df-fz 13445 df-struct 17093 df-slot 17128 df-ndx 17140 df-base 17156 df-hom 17220 df-cco 17221 df-cat 17605 df-cid 17606 df-sect 17685 df-inv 17686 df-iso 17687 df-cic 17734 df-func 17796 df-idfu 17797 df-cofu 17798 df-full 17844 df-fth 17845 df-termo 17923 df-catc 18037 df-thinc 49380 df-termc 49435

This theorem is referenced by: termcterm3 49477 termcciso 49478 termc2 49480

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