termfucterm - Mathbox for Zhi Wang

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Theorem termfucterm 49897

Description: All functors between two terminal categories are isomorphisms. (Contributed by Zhi Wang, 17-Nov-2025.)

**Hypotheses**
Ref	Expression
termfucterm.c	⊢ 𝐶 = (CatCat‘𝑈)
termfucterm.b	⊢ 𝐵 = (Base‘𝐶)
termfucterm.i	⊢ 𝐼 = (Iso‘𝐶)
termfucterm.x	⊢ (𝜑 → 𝑋 ∈ 𝐵)
termfucterm.xt	⊢ (𝜑 → 𝑋 ∈ TermCat)
termfucterm.y	⊢ (𝜑 → 𝑌 ∈ 𝐵)
termfucterm.yt	⊢ (𝜑 → 𝑌 ∈ TermCat)

**Assertion**
Ref	Expression
termfucterm	⊢ (𝜑 → (𝑋 Func 𝑌) = (𝑋𝐼𝑌))

Proof of Theorem termfucterm Dummy variables 𝑓 𝑔 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		termfucterm.yt	. . . . . . 7 ⊢ (𝜑 → 𝑌 ∈ TermCat)
2		termfucterm.c	. . . . . . . 8 ⊢ 𝐶 = (CatCat‘𝑈)
3		termfucterm.b	. . . . . . . 8 ⊢ 𝐵 = (Base‘𝐶)
4		termfucterm.x	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ 𝐵)
5		termfucterm.y	. . . . . . . 8 ⊢ (𝜑 → 𝑌 ∈ 𝐵)
6		termfucterm.xt	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ TermCat)
7	2, 3, 4, 5, 6	termcciso 49869	. . . . . . 7 ⊢ (𝜑 → (𝑌 ∈ TermCat ↔ 𝑋( ≃_𝑐 ‘𝐶)𝑌))
8	1, 7	mpbid 232	. . . . . 6 ⊢ (𝜑 → 𝑋( ≃_𝑐 ‘𝐶)𝑌)
9		termfucterm.i	. . . . . . 7 ⊢ 𝐼 = (Iso‘𝐶)
10		cicrcl2 49396	. . . . . . . 8 ⊢ (𝑋( ≃_𝑐 ‘𝐶)𝑌 → 𝐶 ∈ Cat)
11	8, 10	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ Cat)
12	9, 3, 11, 4, 5	cic 17735	. . . . . 6 ⊢ (𝜑 → (𝑋( ≃_𝑐 ‘𝐶)𝑌 ↔ ∃𝑔 𝑔 ∈ (𝑋𝐼𝑌)))
13	8, 12	mpbid 232	. . . . 5 ⊢ (𝜑 → ∃𝑔 𝑔 ∈ (𝑋𝐼𝑌))
14	13	adantr 480	. . . 4 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) → ∃𝑔 𝑔 ∈ (𝑋𝐼𝑌))
15		eqid 2737	. . . . . . . 8 ⊢ (𝑋 FuncCat 𝑌) = (𝑋 FuncCat 𝑌)
16	6	termccd 49832	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ Cat)
17	15, 16, 1	fucterm 49895	. . . . . . 7 ⊢ (𝜑 → (𝑋 FuncCat 𝑌) ∈ TermCat)
18	17	ad2antrr 727	. . . . . 6 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → (𝑋 FuncCat 𝑌) ∈ TermCat)
19	15	fucbas 17899	. . . . . 6 ⊢ (𝑋 Func 𝑌) = (Base‘(𝑋 FuncCat 𝑌))
20		simplr 769	. . . . . 6 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ (𝑋 Func 𝑌))
21		fullfunc 17844	. . . . . . 7 ⊢ (𝑋 Full 𝑌) ⊆ (𝑋 Func 𝑌)
22		eqid 2737	. . . . . . . . . 10 ⊢ (Base‘𝑋) = (Base‘𝑋)
23		eqid 2737	. . . . . . . . . 10 ⊢ (Base‘𝑌) = (Base‘𝑌)
24		simpr 484	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑔 ∈ (𝑋𝐼𝑌))
25	2, 22, 23, 9, 24	catcisoi 49753	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → (𝑔 ∈ ((𝑋 Full 𝑌) ∩ (𝑋 Faith 𝑌)) ∧ (1^st ‘𝑔):(Base‘𝑋)–1-1-onto→(Base‘𝑌)))
26	25	simpld 494	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑔 ∈ ((𝑋 Full 𝑌) ∩ (𝑋 Faith 𝑌)))
27	26	elin1d 4158	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑔 ∈ (𝑋 Full 𝑌))
28	21, 27	sselid 3933	. . . . . 6 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑔 ∈ (𝑋 Func 𝑌))
29	18, 19, 20, 28	termcbasmo 49836	. . . . 5 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑓 = 𝑔)
30	29, 24	eqeltrd 2837	. . . 4 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ (𝑋𝐼𝑌))
31	14, 30	exlimddv 1937	. . 3 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) → 𝑓 ∈ (𝑋𝐼𝑌))
32		simpr 484	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ (𝑋𝐼𝑌))
33	2, 22, 23, 9, 32	catcisoi 49753	. . . . . 6 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋𝐼𝑌)) → (𝑓 ∈ ((𝑋 Full 𝑌) ∩ (𝑋 Faith 𝑌)) ∧ (1^st ‘𝑓):(Base‘𝑋)–1-1-onto→(Base‘𝑌)))
34	33	simpld 494	. . . . 5 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ ((𝑋 Full 𝑌) ∩ (𝑋 Faith 𝑌)))
35	34	elin1d 4158	. . . 4 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ (𝑋 Full 𝑌))
36	21, 35	sselid 3933	. . 3 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ (𝑋 Func 𝑌))
37	31, 36	impbida 801	. 2 ⊢ (𝜑 → (𝑓 ∈ (𝑋 Func 𝑌) ↔ 𝑓 ∈ (𝑋𝐼𝑌)))
38	37	eqrdv 2735	1 ⊢ (𝜑 → (𝑋 Func 𝑌) = (𝑋𝐼𝑌))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ∃wex 1781 ∈ wcel 2114 ∩ cin 3902 class class class wbr 5100 –1-1-onto→wf1o 6499 ‘cfv 6500 (class class class)co 7368 1^st c1st 7941 Basecbs 17148 Catccat 17599 Isociso 17682 ≃_𝑐 ccic 17731 Func cfunc 17790 Full cful 17840 Faith cfth 17841 FuncCat cfuc 17881 CatCatccatc 18034 TermCatctermc 49825

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-supp 8113 df-tpos 8178 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-map 8777 df-ixp 8848 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-nn 12158 df-2 12220 df-3 12221 df-4 12222 df-5 12223 df-6 12224 df-7 12225 df-8 12226 df-9 12227 df-n0 12414 df-z 12501 df-dec 12620 df-uz 12764 df-fz 13436 df-struct 17086 df-sets 17103 df-slot 17121 df-ndx 17133 df-base 17149 df-hom 17213 df-cco 17214 df-cat 17603 df-cid 17604 df-homf 17605 df-comf 17606 df-oppc 17647 df-sect 17683 df-inv 17684 df-iso 17685 df-cic 17732 df-func 17794 df-idfu 17795 df-cofu 17796 df-full 17842 df-fth 17843 df-nat 17882 df-fuc 17883 df-inito 17920 df-termo 17921 df-catc 18035 df-thinc 49771 df-termc 49826

This theorem is referenced by: (None)

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