termcterm2 - Mathbox for Zhi Wang

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Theorem termcterm2 50096

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 4303	. . 3 ⊢ ((𝑈 ∩ TermCat) ≠ ∅ ↔ ∃𝑑 𝑑 ∈ (𝑈 ∩ TermCat))
3	1, 2	sylib 220	. 2 ⊢ (𝜑 → ∃𝑑 𝑑 ∈ (𝑈 ∩ TermCat))
4		simpr 488	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (𝑈 ∩ TermCat))
5	4	elin2d 4155	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ TermCat)
6	5	termcthind 50060	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ ThinCat)
7		termcterm.e	. . . . 5 ⊢ 𝐸 = (CatCat‘𝑈)
8		eqid 2761	. . . . 5 ⊢ (Base‘𝐸) = (Base‘𝐸)
9		termcterm2.t	. . . . . . . 8 ⊢ (𝜑 → 𝐶 ∈ (TermO‘𝐸))
10	9	adantr 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ (TermO‘𝐸))
11	8	termoo2 49815	. . . . . . 7 ⊢ (𝐶 ∈ (TermO‘𝐸) → 𝐶 ∈ (Base‘𝐸))
12	10, 11	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ (Base‘𝐸))
13	7, 8	elbasfv 17242	. . . . . 6 ⊢ (𝐶 ∈ (Base‘𝐸) → 𝑈 ∈ V)
14	12, 13	syl 17	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑈 ∈ V)
15	4	elin1d 4154	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ 𝑈)
16	5	termccd 50061	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ Cat)
17	15, 16	elind 4150	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (𝑈 ∩ Cat))
18	7, 8, 14	catcbas 18125	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐸) = (𝑈 ∩ Cat))
19	17, 18	eleqtrrd 2864	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (Base‘𝐸))
20		termorcl 18015	. . . . . . 7 ⊢ (𝐶 ∈ (TermO‘𝐸) → 𝐸 ∈ Cat)
21	10, 20	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐸 ∈ Cat)
22	7, 14, 15, 5	termcterm 50095	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝑑 ∈ (TermO‘𝐸))
23	21, 10, 22	termoeu1w 18043	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶( ≃_𝑐 ‘𝐸)𝑑)
24	7, 8, 14, 12, 19, 23	thincciso4 50039	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝐶 ∈ ThinCat ↔ 𝑑 ∈ ThinCat))
25	6, 24	mpbird 259	. . 3 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ ThinCat)
26	21, 10, 22	termoeu1 18042	. . . . . 6 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → ∃!𝑓 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑))
27		euex 2603	. . . . . 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 2761	. . . . . . . 8 ⊢ (Base‘𝐶) = (Base‘𝐶)
30		eqid 2761	. . . . . . . 8 ⊢ (Base‘𝑑) = (Base‘𝑑)
31		eqid 2761	. . . . . . . 8 ⊢ (Iso‘𝐸) = (Iso‘𝐸)
32	7, 8, 29, 30, 14, 12, 19, 31	catciso 18135	. . . . . . 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 503	. . . . . 6 ⊢ (((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) ∧ 𝑓 ∈ (𝐶(Iso‘𝐸)𝑑)) → (1^st ‘𝑓):(Base‘𝐶)–1-1-onto→(Base‘𝑑))
34		fvex 6875	. . . . . . 7 ⊢ (Base‘𝐶) ∈ V
35	34	f1oen 8947	. . . . . 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 1954	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐶) ≈ (Base‘𝑑))
38	30	istermc3 50058	. . . . . 6 ⊢ (𝑑 ∈ TermCat ↔ (𝑑 ∈ ThinCat ∧ (Base‘𝑑) ≈ 1_o))
39	5, 38	sylib 220	. . . . 5 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (𝑑 ∈ ThinCat ∧ (Base‘𝑑) ≈ 1_o))
40	39	simprd 499	. . . 4 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝑑) ≈ 1_o)
41		entr 8981	. . . 4 ⊢ (((Base‘𝐶) ≈ (Base‘𝑑) ∧ (Base‘𝑑) ≈ 1_o) → (Base‘𝐶) ≈ 1_o)
42	37, 40, 41	syl2anc 593	. . 3 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → (Base‘𝐶) ≈ 1_o)
43	29	istermc3 50058	. . 3 ⊢ (𝐶 ∈ TermCat ↔ (𝐶 ∈ ThinCat ∧ (Base‘𝐶) ≈ 1_o))
44	25, 42, 43	sylanbrc 592	. 2 ⊢ ((𝜑 ∧ 𝑑 ∈ (𝑈 ∩ TermCat)) → 𝐶 ∈ TermCat)
45	3, 44	exlimddv 1954	1 ⊢ (𝜑 → 𝐶 ∈ TermCat)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 399 = wceq 1559 ∃wex 1798 ∈ wcel 2141 ∃!weu 2594 ≠ wne 2956 Vcvv 3453 ∩ cin 3901 ∅c0 4283 class class class wbr 5097 –1-1-onto→wf1o 6515 ‘cfv 6516 (class class class)co 7391 1^st c1st 7963 1_oc1o 8424 ≈ cen 8918 Basecbs 17236 Catccat 17687 Isociso 17770 Full cful 17928 Faith cfth 17929 TermOctermo 18006 CatCatccatc 18122 ThinCatcthinc 49999 TermCatctermc 50054

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-tp 4584 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-supp 8135 df-frecs 8256 df-wrecs 8287 df-recs 8336 df-rdg 8375 df-1o 8431 df-er 8672 df-map 8804 df-ixp 8874 df-en 8922 df-dom 8923 df-sdom 8924 df-fin 8925 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-uz 12834 df-fz 13507 df-struct 17174 df-slot 17209 df-ndx 17221 df-base 17237 df-hom 17301 df-cco 17302 df-cat 17691 df-cid 17692 df-sect 17771 df-inv 17772 df-iso 17773 df-cic 17820 df-func 17882 df-idfu 17883 df-cofu 17884 df-full 17930 df-fth 17931 df-termo 18009 df-catc 18123 df-thinc 50000 df-termc 50055

This theorem is referenced by: termcterm3 50097 termcciso 50098 termc2 50100

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