Theorem diag1 49549

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 17786	. . 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 18165	. . 3 ⊢ (𝜑 → 𝐾 ∈ (𝐷 Func 𝐶))
9		1st2nd 7983	. . 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 7986	. . . . . . 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 17790	. . . . 5 ⊢ (𝜑 → (1st ‘𝐾):𝐵⟶𝐴)
15	14	feqmptd 6902	. . . 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 18166	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵) → ((1st ‘𝐾)‘𝑦) = 𝑋)
21	20	mpteq2dva 5191	. . . 4 ⊢ (𝜑 → (𝑦 ∈ 𝐵 ↦ ((1st ‘𝐾)‘𝑦)) = (𝑦 ∈ 𝐵 ↦ 𝑋))
22	15, 21	eqtrd 2771	. . 3 ⊢ (𝜑 → (1st ‘𝐾) = (𝑦 ∈ 𝐵 ↦ 𝑋))
23	11, 13	funcfn2 17793	. . . . 5 ⊢ (𝜑 → (2nd ‘𝐾) Fn (𝐵 × 𝐵))
24		fnov 7489	. . . . 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 2736	. . . . . . . 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 17792	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑦(2nd ‘𝐾)𝑧):(𝑦𝐽𝑧)⟶(((1st ‘𝐾)‘𝑦)(Hom ‘𝐶)((1st ‘𝐾)‘𝑧)))
32	31	feqmptd 6902	. . . . . 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 18167	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) ∧ 𝑓 ∈ (𝑦𝐽𝑧)) → ((𝑦(2nd ‘𝐾)𝑧)‘𝑓) = ( 1 ‘𝑋))
42	41	mpteq2dva 5191	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑓 ∈ (𝑦𝐽𝑧) ↦ ((𝑦(2nd ‘𝐾)𝑧)‘𝑓)) = (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))
43	32, 42	eqtrd 2771	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐵 ∧ 𝑧 ∈ 𝐵) → (𝑦(2nd ‘𝐾)𝑧) = (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))
44	43	mpoeq3dva 7435	. . . 4 ⊢ (𝜑 → (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑦(2nd ‘𝐾)𝑧)) = (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋))))
45	25, 44	eqtrd 2771	. . 3 ⊢ (𝜑 → (2nd ‘𝐾) = (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋))))
46	22, 45	opeq12d 4837	. 2 ⊢ (𝜑 → ⟨(1st ‘𝐾), (2nd ‘𝐾)⟩ = ⟨(𝑦 ∈ 𝐵 ↦ 𝑋), (𝑦 ∈ 𝐵, 𝑧 ∈ 𝐵 ↦ (𝑓 ∈ (𝑦𝐽𝑧) ↦ ( 1 ‘𝑋)))⟩)
47	10, 46	eqtrd 2771	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 2113  ⟨cop 4586   class class class wbr 5098   ↦ cmpt 5179   × cxp 5622  Rel wrel 5629   Fn wfn 6487  ‘cfv 6492  (class class class)co 7358   ∈ cmpo 7360  1^st c1st 7931  2^nd c2nd 7932  Basecbs 17136  Hom chom 17188  Catccat 17587  Idccid 17588   Func cfunc 17778  Δ_funccdiag 18135

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 2115  ax-9 2123  ax-10 2146  ax-11 2162  ax-12 2184  ax-ext 2708  ax-rep 5224  ax-sep 5241  ax-nul 5251  ax-pow 5310  ax-pr 5377  ax-un 7680  ax-cnex 11082  ax-resscn 11083  ax-1cn 11084  ax-icn 11085  ax-addcl 11086  ax-addrcl 11087  ax-mulcl 11088  ax-mulrcl 11089  ax-mulcom 11090  ax-addass 11091  ax-mulass 11092  ax-distr 11093  ax-i2m1 11094  ax-1ne0 11095  ax-1rid 11096  ax-rnegex 11097  ax-rrecex 11098  ax-cnre 11099  ax-pre-lttri 11100  ax-pre-lttrn 11101  ax-pre-ltadd 11102  ax-pre-mulgt0 11103

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 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-nel 3037  df-ral 3052  df-rex 3061  df-rmo 3350  df-reu 3351  df-rab 3400  df-v 3442  df-sbc 3741  df-csb 3850  df-dif 3904  df-un 3906  df-in 3908  df-ss 3918  df-pss 3921  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4581  df-pr 4583  df-tp 4585  df-op 4587  df-uni 4864  df-iun 4948  df-br 5099  df-opab 5161  df-mpt 5180  df-tr 5206  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 7315  df-ov 7361  df-oprab 7362  df-mpo 7363  df-om 7809  df-1st 7933  df-2nd 7934  df-frecs 8223  df-wrecs 8254  df-recs 8303  df-rdg 8341  df-1o 8397  df-er 8635  df-map 8765  df-ixp 8836  df-en 8884  df-dom 8885  df-sdom 8886  df-fin 8887  df-pnf 11168  df-mnf 11169  df-xr 11170  df-ltxr 11171  df-le 11172  df-sub 11366  df-neg 11367  df-nn 12146  df-2 12208  df-3 12209  df-4 12210  df-5 12211  df-6 12212  df-7 12213  df-8 12214  df-9 12215  df-n0 12402  df-z 12489  df-dec 12608  df-uz 12752  df-fz 13424  df-struct 17074  df-slot 17109  df-ndx 17121  df-base 17137  df-hom 17201  df-cco 17202  df-cat 17591  df-cid 17592  df-func 17782  df-nat 17870  df-fuc 17871  df-xpc 18095  df-1stf 18096  df-curf 18137  df-diag 18139

This theorem is referenced by:  diag1a  49550