termcterm2 - Mathbox for Zhi Wang

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Theorem termcterm2 50004

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 4281	. . 3 ⊢ ((𝑈 ∩ TermCat) ≠ ∅ ↔ ∃𝑑 𝑑 ∈ (𝑈 ∩ TermCat))
3	1, 2	sylib 219	. 2 ⊢ (𝜑 → ∃𝑑 𝑑 ∈ (𝑈 ∩ TermCat))
4		simpr 485	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (𝑈 ∩ TermCat))
5	4	elin2d 4134	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ TermCat)
6	5	termcthind 49968	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ ThinCat)
7		termcterm.e	. . . . 5 ⊢ 𝐸 = (CatCat‘𝑈)
8		eqid 2739	. . . . 5 ⊢ (Base‘𝐸) = (Base‘𝐸)
9		termcterm2.t	. . . . . . . 8 ⊢ (𝜑 → 𝐶 ∈ (TermO‘𝐸))
10	9	adantr 481	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ (TermO‘𝐸))
11	8	termoo2 49723	. . . . . . 7 ⊢ (𝐶 ∈ (TermO‘𝐸) → 𝐶 ∈ (Base‘𝐸))
12	10, 11	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ (Base‘𝐸))
13	7, 8	elbasfv 17176	. . . . . 6 ⊢ (𝐶 ∈ (Base‘𝐸) → 𝑈 ∈ V)
14	12, 13	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑈 ∈ V)
15	4	elin1d 4133	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ 𝑈)
16	5	termccd 49969	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ Cat)
17	15, 16	elind 4129	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (𝑈 ∩ Cat))
18	7, 8, 14	catcbas 18059	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐸) = (𝑈 ∩ Cat))
19	17, 18	eleqtrrd 2842	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (Base‘𝐸))
20		termorcl 17949	. . . . . . 7 ⊢ (𝐶 ∈ (TermO‘𝐸) → 𝐸 ∈ Cat)
21	10, 20	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐸 ∈ Cat)
22	7, 14, 15, 5	termcterm 50003	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (TermO‘𝐸))
23	21, 10, 22	termoeu1w 17977	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶( ≃_𝑐 ‘𝐸)𝑑)
24	7, 8, 14, 12, 19, 23	thincciso4 49947	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝐶 ∈ ThinCat ↔ 𝑑 ∈ ThinCat))
25	6, 24	mpbird 258	. . 3 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ ThinCat)
26	21, 10, 22	termoeu1 17976	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → ∃!𝑓 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑))
27		euex 2581	. . . . . 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 2739	. . . . . . . 8 ⊢ (Base‘𝐶) = (Base‘𝐶)
30		eqid 2739	. . . . . . . 8 ⊢ (Base‘𝑑) = (Base‘𝑑)
31		eqid 2739	. . . . . . . 8 ⊢ (Iso‘𝐸) = (Iso‘𝐸)
32	7, 8, 29, 30, 14, 12, 19, 31	catciso 18069	. . . . . . 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 500	. . . . . 6 ⊢ (((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) ∧ 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑)) → (1^st ‘𝑓):(Base‘𝐶)–1-1-onto→(Base‘𝑑))
34		fvex 6840	. . . . . . 7 ⊢ (Base‘𝐶) ∈ V
35	34	f1oen 8909	. . . . . 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 1942	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐶) ≈ (Base‘𝑑))
38	30	istermc3 49966	. . . . . 6 ⊢ (𝑑 ∈ TermCat ↔ (𝑑 ∈ ThinCat ∧ (Base‘𝑑) ≈ 1_o))
39	5, 38	sylib 219	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝑑 ∈ ThinCat ∧ (Base‘𝑑) ≈ 1_o))
40	39	simprd 496	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝑑) ≈ 1_o)
41		entr 8943	. . . 4 ⊢ (((Base‘𝐶) ≈ (Base‘𝑑) ∧ (Base‘𝑑) ≈ 1_o) → (Base‘𝐶) ≈ 1_o)
42	37, 40, 41	syl2anc 590	. . 3 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐶) ≈ 1_o)
43	29	istermc3 49966	. . 3 ⊢ (𝐶 ∈ TermCat ↔ (𝐶 ∈ ThinCat ∧ (Base‘𝐶) ≈ 1_o))
44	25, 42, 43	sylanbrc 589	. 2 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ TermCat)
45	3, 44	exlimddv 1942	1 ⊢ (𝜑 → 𝐶 ∈ TermCat)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∃wex 1786 ∈ wcel 2119 ∃!weu 2572 ≠ wne 2934 Vcvv 3431 ∩ cin 3882 ∅c0 4261 class class class wbr 5072 –1-1-onto→wf1o 6484 ‘cfv 6485 (class class class)co 7356 1^st c1st 7929 1_oc1o 8388 ≈ cen 8880 Basecbs 17170 Catccat 17621 Isociso 17704 Full cful 17862 Faith cfth 17863 TermOctermo 17940 CatCatccatc 18056 ThinCatcthinc 49907 TermCatctermc 49962

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-rep 5199 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678 ax-cnex 11085 ax-resscn 11086 ax-1cn 11087 ax-icn 11088 ax-addcl 11089 ax-addrcl 11090 ax-mulcl 11091 ax-mulrcl 11092 ax-mulcom 11093 ax-addass 11094 ax-mulass 11095 ax-distr 11096 ax-i2m1 11097 ax-1ne0 11098 ax-1rid 11099 ax-rnegex 11100 ax-rrecex 11101 ax-cnre 11102 ax-pre-lttri 11103 ax-pre-lttrn 11104 ax-pre-ltadd 11105 ax-pre-mulgt0 11106

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-nel 3039 df-ral 3054 df-rex 3064 df-rmo 3344 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3903 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-tp 4560 df-op 4562 df-uni 4839 df-iun 4923 df-br 5073 df-opab 5135 df-mpt 5154 df-tr 5180 df-id 5513 df-eprel 5518 df-po 5526 df-so 5527 df-fr 5571 df-we 5573 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-pred 6252 df-ord 6313 df-on 6314 df-lim 6315 df-suc 6316 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-om 7807 df-1st 7931 df-2nd 7932 df-supp 8101 df-frecs 8221 df-wrecs 8252 df-recs 8301 df-rdg 8339 df-1o 8395 df-er 8633 df-map 8765 df-ixp 8836 df-en 8884 df-dom 8885 df-sdom 8886 df-fin 8887 df-pnf 11172 df-mnf 11173 df-xr 11174 df-ltxr 11175 df-le 11176 df-sub 11370 df-neg 11371 df-nn 12166 df-2 12235 df-3 12236 df-4 12237 df-5 12238 df-6 12239 df-7 12240 df-8 12241 df-9 12242 df-n0 12429 df-z 12516 df-dec 12636 df-uz 12780 df-fz 13453 df-struct 17108 df-slot 17143 df-ndx 17155 df-base 17171 df-hom 17235 df-cco 17236 df-cat 17625 df-cid 17626 df-sect 17705 df-inv 17706 df-iso 17707 df-cic 17754 df-func 17816 df-idfu 17817 df-cofu 17818 df-full 17864 df-fth 17865 df-termo 17943 df-catc 18057 df-thinc 49908 df-termc 49963

This theorem is referenced by: termcterm3 50005 termcciso 50006 termc2 50008

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