termfucterm - Mathbox for Zhi Wang

	Mathbox for Zhi Wang		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > Mathboxes > termfucterm		Structured version Visualization version GIF version

Theorem termfucterm 50031

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 50003	. . . . . . 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 49530	. . . . . . . 8 ⊢ (𝑋( ≃_𝑐 ‘𝐶)𝑌 → 𝐶 ∈ Cat)
11	8, 10	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ Cat)
12	9, 3, 11, 4, 5	cic 17757	. . . . . 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 49966	. . . . . . . 8 ⊢ (𝜑 → 𝑋 ∈ Cat)
17	15, 16, 1	fucterm 50029	. . . . . . 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 17921	. . . . . 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 17866	. . . . . . 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 49887	. . . . . . . . 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 4145	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑔 ∈ (𝑋 Full 𝑌))
28	21, 27	sselid 3920	. . . . . 6 ⊢ (((𝜑 ∧ 𝑓 ∈ (𝑋 Func 𝑌)) ∧ 𝑔 ∈ (𝑋𝐼𝑌)) → 𝑔 ∈ (𝑋 Func 𝑌))
29	18, 19, 20, 28	termcbasmo 49970	. . . . 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 49887	. . . . . 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 4145	. . . 4 ⊢ ((𝜑 ∧ 𝑓 ∈ (𝑋𝐼𝑌)) → 𝑓 ∈ (𝑋 Full 𝑌))
36	21, 35	sselid 3920	. . 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 3889 class class class wbr 5086 –1-1-onto→wf1o 6491 ‘cfv 6492 (class class class)co 7360 1^st c1st 7933 Basecbs 17170 Catccat 17621 Isociso 17704 ≃_𝑐 ccic 17753 Func cfunc 17812 Full cful 17862 Faith cfth 17863 FuncCat cfuc 17903 CatCatccatc 18056 TermCatctermc 49959

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 5212 ax-sep 5231 ax-nul 5241 ax-pow 5302 ax-pr 5370 ax-un 7682 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 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 3343 df-reu 3344 df-rab 3391 df-v 3432 df-sbc 3730 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-tp 4573 df-op 4575 df-uni 4852 df-iun 4936 df-br 5087 df-opab 5149 df-mpt 5168 df-tr 5194 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7317 df-ov 7363 df-oprab 7364 df-mpo 7365 df-om 7811 df-1st 7935 df-2nd 7936 df-supp 8104 df-tpos 8169 df-frecs 8224 df-wrecs 8255 df-recs 8304 df-rdg 8342 df-1o 8398 df-er 8636 df-map 8768 df-ixp 8839 df-en 8887 df-dom 8888 df-sdom 8889 df-fin 8890 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-sets 17125 df-slot 17143 df-ndx 17155 df-base 17171 df-hom 17235 df-cco 17236 df-cat 17625 df-cid 17626 df-homf 17627 df-comf 17628 df-oppc 17669 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-nat 17904 df-fuc 17905 df-inito 17942 df-termo 17943 df-catc 18057 df-thinc 49905 df-termc 49960

This theorem is referenced by: (None)

W3C validator