Theorem diag1 49336

Description: The constant functor of 𝑋. Example 3.20(2) of [Adamek] p. 30. (Contributed by Zhi Wang, 17-Oct-2025.)

Hypotheses

Ref	Expression
diag1.l	⊢ 𝐿 = (𝐶Δfunc𝐷)
diag1.c	⊢ (𝜑 → 𝐶 ∈ Cat)
diag1.d	⊢ (𝜑 → 𝐷 ∈ Cat)
diag1.a	⊢ 𝐴 = (Base‘𝐶)
diag1.x	⊢ (𝜑 → 𝑋 ∈ 𝐴)
diag1.k	⊢ 𝐾 = ((1st ‘𝐿)‘𝑋)
diag1.b	⊢ 𝐵 = (Base‘𝐷)
diag1.j	⊢ 𝐽 = (Hom ‘𝐷)
diag1.i	⊢ 1 = (Id‘𝐶)

Assertion

Ref	Expression
diag1	⊢ (𝜑 → 𝐾 = ⟨(𝑦 ∈ 𝐵 ↦ 𝑋), (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))⟩)

Distinct variable groups:   𝐵,𝑓,𝑦,𝑧   𝑓,𝐽   𝑓,𝐾,𝑦,𝑧   𝜑,𝑓,𝑦,𝑧

Allowed substitution hints:   𝐴(𝑦,𝑧,𝑓)   𝐶(𝑦,𝑧,𝑓)   𝐷(𝑦,𝑧,𝑓)   1 (𝑦,𝑧,𝑓)   𝐽(𝑦,𝑧)   𝐿(𝑦,𝑧,𝑓)   𝑋(𝑦,𝑧,𝑓)

Proof of Theorem diag1

Step	Hyp	Ref	Expression
1		relfunc 17764	. . 3 ⊢ Rel (𝐷 Func 𝐶)
2		diag1.l	. . . 4 ⊢ 𝐿 = (𝐶Δfunc𝐷)
3		diag1.c	. . . 4 ⊢ (𝜑 → 𝐶 ∈ Cat)
4		diag1.d	. . . 4 ⊢ (𝜑 → 𝐷 ∈ Cat)
5		diag1.a	. . . 4 ⊢ 𝐴 = (Base‘𝐶)
6		diag1.x	. . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝐴)
7		diag1.k	. . . 4 ⊢ 𝐾 = ((1st ‘𝐿)‘𝑋)
8	2, 3, 4, 5, 6, 7	diag1cl 18143	. . 3 ⊢ (𝜑 → 𝐾 ∈ (𝐷 Func 𝐶))
9		1st2nd 7966	. . 3 ⊢ ((Rel (𝐷 Func 𝐶) ∧ 𝐾 ∈ (𝐷 Func 𝐶)) → 𝐾 = ⟨(1st ‘𝐾), (2nd ‘𝐾)⟩)
10	1, 8, 9	sylancr 587	. 2 ⊢ (𝜑 → 𝐾 = ⟨(1st ‘𝐾), (2nd ‘𝐾)⟩)
11		diag1.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝐷)
12		1st2ndbr 7969	. . . . . . 7 ⊢ ((Rel (𝐷 Func 𝐶) ∧ 𝐾 ∈ (𝐷 Func 𝐶)) → (1st ‘𝐾)(𝐷 Func 𝐶)(2nd ‘𝐾))
13	1, 8, 12	sylancr 587	. . . . . 6 ⊢ (𝜑 → (1st ‘𝐾)(𝐷 Func 𝐶)(2nd ‘𝐾))
14	11, 5, 13	funcf1 17768	. . . . 5 ⊢ (𝜑 → (1st ‘𝐾):𝐵⟶𝐴)
15	14	feqmptd 6885	. . . 4 ⊢ (𝜑 → (1st ‘𝐾) = (𝑦 ∈ 𝐵 ↦ ((1st ‘𝐾)‘𝑦)))
16	3	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵) → 𝐶 ∈ Cat)
17	4	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵) → 𝐷 ∈ Cat)
18	6	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵) → 𝑋 ∈ 𝐴)
19		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵) → 𝑦 ∈ 𝐵)
20	2, 16, 17, 5, 18, 7, 11, 19	diag11 18144	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵) → ((1st ‘𝐾)‘𝑦) = 𝑋)
21	20	mpteq2dva 5179	. . . 4 ⊢ (𝜑 → (𝑦 ∈ 𝐵 ↦ ((1st ‘𝐾)‘𝑦)) = (𝑦 ∈ 𝐵 ↦ 𝑋))
22	15, 21	eqtrd 2766	. . 3 ⊢ (𝜑 → (1st ‘𝐾) = (𝑦 ∈ 𝐵 ↦ 𝑋))
23	11, 13	funcfn2 17771	. . . . 5 ⊢ (𝜑 → (2nd ‘𝐾) Fn (𝐵 × 𝐵))
24		fnov 7472	. . . . 5 ⊢ ((2nd ‘𝐾) Fn (𝐵 × 𝐵) ↔ (2nd ‘𝐾) = (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑦(2nd ‘𝐾)𝑧)))
25	23, 24	sylib 218	. . . 4 ⊢ (𝜑 → (2nd ‘𝐾) = (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑦(2nd ‘𝐾)𝑧)))
26		diag1.j	. . . . . . . 8 ⊢ 𝐽 = (Hom ‘𝐷)
27		eqid 2731	. . . . . . . 8 ⊢ (Hom ‘𝐶) = (Hom ‘𝐶)
28	13	3ad2ant1 1133	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (1st ‘𝐾)(𝐷 Func 𝐶)(2nd ‘𝐾))
29		simp2 1137	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → 𝑦 ∈ 𝐵)
30		simp3 1138	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → 𝑧 ∈ 𝐵)
31	11, 26, 27, 28, 29, 30	funcf2 17770	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑦(2nd ‘𝐾)𝑧):(𝑦𝐽𝑧)⟶(((1st ‘𝐾)‘𝑦)(Hom ‘𝐶)((1st ‘𝐾)‘𝑧)))
32	31	feqmptd 6885	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑦(2nd ‘𝐾)𝑧) = (𝑓 ∈ (𝑦𝐽𝑧) ↦ ((𝑦(2nd ‘𝐾)𝑧)‘𝑓)))
33		simpl1 1192	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝜑)
34	33, 3	syl 17	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝐶 ∈ Cat)
35	33, 4	syl 17	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝐷 ∈ Cat)
36	33, 6	syl 17	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝑋 ∈ 𝐴)
37	29	adantr 480	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝑦 ∈ 𝐵)
38		diag1.i	. . . . . . . 8 ⊢ 1 = (Id‘𝐶)
39	30	adantr 480	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝑧 ∈ 𝐵)
40		simpr 484	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → 𝑓 ∈ (𝑦𝐽𝑧))
41	2, 34, 35, 5, 36, 7, 11, 37, 26, 38, 39, 40	diag12 18145	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → ((𝑦(2nd ‘𝐾)𝑧)‘𝑓) = ( 1 ‘𝑋))
42	41	mpteq2dva 5179	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑓 ∈ (𝑦𝐽𝑧) ↦ ((𝑦(2nd ‘𝐾)𝑧)‘𝑓)) = (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))
43	32, 42	eqtrd 2766	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑦(2nd ‘𝐾)𝑧) = (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))
44	43	mpoeq3dva 7418	. . . 4 ⊢ (𝜑 → (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑦(2nd ‘𝐾)𝑧)) = (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋))))
45	25, 44	eqtrd 2766	. . 3 ⊢ (𝜑 → (2nd ‘𝐾) = (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋))))
46	22, 45	opeq12d 4828	. 2 ⊢ (𝜑 → ⟨(1st ‘𝐾), (2nd ‘𝐾)⟩ = ⟨(𝑦 ∈ 𝐵 ↦ 𝑋), (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))⟩)
47	10, 46	eqtrd 2766	1 ⊢ (𝜑 → 𝐾 = ⟨(𝑦 ∈ 𝐵 ↦ 𝑋), (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))⟩)

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1086   = wceq 1541   ∈ wcel 2111  ⟨cop 4577   class class class wbr 5086   ↦ cmpt 5167   × cxp 5609  Rel wrel 5616   Fn wfn 6471  ‘cfv 6476  (class class class)co 7341   ∈ cmpo 7343  1^st c1st 7914  2^nd c2nd 7915  Basecbs 17115  Hom chom 17167  Catccat 17565  Idccid 17566   Func cfunc 17756  Δ_funccdiag 18113

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-rep 5212  ax-sep 5229  ax-nul 5239  ax-pow 5298  ax-pr 5365  ax-un 7663  ax-cnex 11057  ax-resscn 11058  ax-1cn 11059  ax-icn 11060  ax-addcl 11061  ax-addrcl 11062  ax-mulcl 11063  ax-mulrcl 11064  ax-mulcom 11065  ax-addass 11066  ax-mulass 11067  ax-distr 11068  ax-i2m1 11069  ax-1ne0 11070  ax-1rid 11071  ax-rnegex 11072  ax-rrecex 11073  ax-cnre 11074  ax-pre-lttri 11075  ax-pre-lttrn 11076  ax-pre-ltadd 11077  ax-pre-mulgt0 11078

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-eu 2564  df-clab 2710  df-cleq 2723  df-clel 2806  df-nfc 2881  df-ne 2929  df-nel 3033  df-ral 3048  df-rex 3057  df-rmo 3346  df-reu 3347  df-rab 3396  df-v 3438  df-sbc 3737  df-csb 3846  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-pss 3917  df-nul 4279  df-if 4471  df-pw 4547  df-sn 4572  df-pr 4574  df-tp 4576  df-op 4578  df-uni 4855  df-iun 4938  df-br 5087  df-opab 5149  df-mpt 5168  df-tr 5194  df-id 5506  df-eprel 5511  df-po 5519  df-so 5520  df-fr 5564  df-we 5566  df-xp 5617  df-rel 5618  df-cnv 5619  df-co 5620  df-dm 5621  df-rn 5622  df-res 5623  df-ima 5624  df-pred 6243  df-ord 6304  df-on 6305  df-lim 6306  df-suc 6307  df-iota 6432  df-fun 6478  df-fn 6479  df-f 6480  df-f1 6481  df-fo 6482  df-f1o 6483  df-fv 6484  df-riota 7298  df-ov 7344  df-oprab 7345  df-mpo 7346  df-om 7792  df-1st 7916  df-2nd 7917  df-frecs 8206  df-wrecs 8237  df-recs 8286  df-rdg 8324  df-1o 8380  df-er 8617  df-map 8747  df-ixp 8817  df-en 8865  df-dom 8866  df-sdom 8867  df-fin 8868  df-pnf 11143  df-mnf 11144  df-xr 11145  df-ltxr 11146  df-le 11147  df-sub 11341  df-neg 11342  df-nn 12121  df-2 12183  df-3 12184  df-4 12185  df-5 12186  df-6 12187  df-7 12188  df-8 12189  df-9 12190  df-n0 12377  df-z 12464  df-dec 12584  df-uz 12728  df-fz 13403  df-struct 17053  df-slot 17088  df-ndx 17100  df-base 17116  df-hom 17180  df-cco 17181  df-cat 17569  df-cid 17570  df-func 17760  df-nat 17848  df-fuc 17849  df-xpc 18073  df-1stf 18074  df-curf 18115  df-diag 18117

This theorem is referenced by:  diag1a  49337