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Theorem catlid 16942
Description: Left identity property of an identity arrow. (Contributed by Mario Carneiro, 2-Jan-2017.)
Hypotheses
Ref Expression
catidcl.b 𝐵 = (Base‘𝐶)
catidcl.h 𝐻 = (Hom ‘𝐶)
catidcl.i 1 = (Id‘𝐶)
catidcl.c (𝜑𝐶 ∈ Cat)
catidcl.x (𝜑𝑋𝐵)
catlid.o · = (comp‘𝐶)
catlid.y (𝜑𝑌𝐵)
catlid.f (𝜑𝐹 ∈ (𝑋𝐻𝑌))
Assertion
Ref Expression
catlid (𝜑 → (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝐹) = 𝐹)

Proof of Theorem catlid
Dummy variables 𝑓 𝑔 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 oveq2 7153 . . 3 (𝑓 = 𝐹 → (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝑓) = (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝐹))
2 id 22 . . 3 (𝑓 = 𝐹𝑓 = 𝐹)
31, 2eqeq12d 2834 . 2 (𝑓 = 𝐹 → ((( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝑓) = 𝑓 ↔ (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝐹) = 𝐹))
4 oveq1 7152 . . . 4 (𝑥 = 𝑋 → (𝑥𝐻𝑌) = (𝑋𝐻𝑌))
5 opeq1 4795 . . . . . . 7 (𝑥 = 𝑋 → ⟨𝑥, 𝑌⟩ = ⟨𝑋, 𝑌⟩)
65oveq1d 7160 . . . . . 6 (𝑥 = 𝑋 → (⟨𝑥, 𝑌· 𝑌) = (⟨𝑋, 𝑌· 𝑌))
76oveqd 7162 . . . . 5 (𝑥 = 𝑋 → (( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝑓))
87eqeq1d 2820 . . . 4 (𝑥 = 𝑋 → ((( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ↔ (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝑓) = 𝑓))
94, 8raleqbidv 3399 . . 3 (𝑥 = 𝑋 → (∀𝑓 ∈ (𝑥𝐻𝑌)(( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ↔ ∀𝑓 ∈ (𝑋𝐻𝑌)(( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝑓) = 𝑓))
10 simpl 483 . . . . . . . 8 ((∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓) → ∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓)
1110ralimi 3157 . . . . . . 7 (∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓) → ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓)
1211a1i 11 . . . . . 6 (𝑔 ∈ (𝑌𝐻𝑌) → (∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓) → ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓))
1312ss2rabi 4050 . . . . 5 {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)} ⊆ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓}
14 catidcl.b . . . . . . 7 𝐵 = (Base‘𝐶)
15 catidcl.h . . . . . . 7 𝐻 = (Hom ‘𝐶)
16 catlid.o . . . . . . 7 · = (comp‘𝐶)
17 catidcl.c . . . . . . 7 (𝜑𝐶 ∈ Cat)
18 catidcl.i . . . . . . 7 1 = (Id‘𝐶)
19 catlid.y . . . . . . 7 (𝜑𝑌𝐵)
2014, 15, 16, 17, 18, 19cidval 16936 . . . . . 6 (𝜑 → ( 1𝑌) = (𝑔 ∈ (𝑌𝐻𝑌)∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)))
2114, 15, 16, 17, 19catideu 16934 . . . . . . 7 (𝜑 → ∃!𝑔 ∈ (𝑌𝐻𝑌)∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓))
22 riotacl2 7119 . . . . . . 7 (∃!𝑔 ∈ (𝑌𝐻𝑌)∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓) → (𝑔 ∈ (𝑌𝐻𝑌)∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)) ∈ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)})
2321, 22syl 17 . . . . . 6 (𝜑 → (𝑔 ∈ (𝑌𝐻𝑌)∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)) ∈ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)})
2420, 23eqeltrd 2910 . . . . 5 (𝜑 → ( 1𝑌) ∈ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵 (∀𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ∧ ∀𝑓 ∈ (𝑌𝐻𝑥)(𝑓(⟨𝑌, 𝑌· 𝑥)𝑔) = 𝑓)})
2513, 24sseldi 3962 . . . 4 (𝜑 → ( 1𝑌) ∈ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓})
26 oveq1 7152 . . . . . . . 8 (𝑔 = ( 1𝑌) → (𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = (( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓))
2726eqeq1d 2820 . . . . . . 7 (𝑔 = ( 1𝑌) → ((𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ↔ (( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓))
28272ralbidv 3196 . . . . . 6 (𝑔 = ( 1𝑌) → (∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓 ↔ ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓))
2928elrab 3677 . . . . 5 (( 1𝑌) ∈ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓} ↔ (( 1𝑌) ∈ (𝑌𝐻𝑌) ∧ ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓))
3029simprbi 497 . . . 4 (( 1𝑌) ∈ {𝑔 ∈ (𝑌𝐻𝑌) ∣ ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(𝑔(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓} → ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓)
3125, 30syl 17 . . 3 (𝜑 → ∀𝑥𝐵𝑓 ∈ (𝑥𝐻𝑌)(( 1𝑌)(⟨𝑥, 𝑌· 𝑌)𝑓) = 𝑓)
32 catidcl.x . . 3 (𝜑𝑋𝐵)
339, 31, 32rspcdva 3622 . 2 (𝜑 → ∀𝑓 ∈ (𝑋𝐻𝑌)(( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝑓) = 𝑓)
34 catlid.f . 2 (𝜑𝐹 ∈ (𝑋𝐻𝑌))
353, 33, 34rspcdva 3622 1 (𝜑 → (( 1𝑌)(⟨𝑋, 𝑌· 𝑌)𝐹) = 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396   = wceq 1528  wcel 2105  wral 3135  ∃!wreu 3137  {crab 3139  cop 4563  cfv 6348  crio 7102  (class class class)co 7145  Basecbs 16471  Hom chom 16564  compcco 16565  Catccat 16923  Idccid 16924
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-rep 5181  ax-sep 5194  ax-nul 5201  ax-pr 5320
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ne 3014  df-ral 3140  df-rex 3141  df-reu 3142  df-rmo 3143  df-rab 3144  df-v 3494  df-sbc 3770  df-csb 3881  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4831  df-iun 4912  df-br 5058  df-opab 5120  df-mpt 5138  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-riota 7103  df-ov 7148  df-cat 16927  df-cid 16928
This theorem is referenced by:  oppccatid  16977  sectcan  17013  sectco  17014  sectmon  17040  monsect  17041  sectid  17044  invisoinvl  17048  subccatid  17104  fucidcl  17223  fuclid  17224  invfuc  17232  arwlid  17320  xpccatid  17426  evlfcl  17460  curf1cl  17466  curf2cl  17469  curfcl  17470  curfuncf  17476  uncfcurf  17477  hofcl  17497  yon12  17503  yon2  17504  yonedalem3b  17517  yonedainv  17519
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