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Theorem coafval 17390
 Description: The value of the composition of arrows. (Contributed by Mario Carneiro, 11-Jan-2017.)
Hypotheses
Ref Expression
coafval.o · = (compa𝐶)
coafval.a 𝐴 = (Arrow‘𝐶)
coafval.x = (comp‘𝐶)
Assertion
Ref Expression
coafval · = (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩)
Distinct variable groups:   𝑓,𝑔,,𝐴   𝐶,𝑓,𝑔,
Allowed substitution hints:   (𝑓,𝑔,)   · (𝑓,𝑔,)

Proof of Theorem coafval
Dummy variable 𝑐 is distinct from all other variables.
StepHypRef Expression
1 coafval.o . 2 · = (compa𝐶)
2 fveq2 6658 . . . . . 6 (𝑐 = 𝐶 → (Arrow‘𝑐) = (Arrow‘𝐶))
3 coafval.a . . . . . 6 𝐴 = (Arrow‘𝐶)
42, 3eqtr4di 2811 . . . . 5 (𝑐 = 𝐶 → (Arrow‘𝑐) = 𝐴)
54rabeqdv 3397 . . . . 5 (𝑐 = 𝐶 → { ∈ (Arrow‘𝑐) ∣ (coda) = (doma𝑔)} = {𝐴 ∣ (coda) = (doma𝑔)})
6 fveq2 6658 . . . . . . . . 9 (𝑐 = 𝐶 → (comp‘𝑐) = (comp‘𝐶))
7 coafval.x . . . . . . . . 9 = (comp‘𝐶)
86, 7eqtr4di 2811 . . . . . . . 8 (𝑐 = 𝐶 → (comp‘𝑐) = )
98oveqd 7167 . . . . . . 7 (𝑐 = 𝐶 → (⟨(doma𝑓), (doma𝑔)⟩(comp‘𝑐)(coda𝑔)) = (⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔)))
109oveqd 7167 . . . . . 6 (𝑐 = 𝐶 → ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩(comp‘𝑐)(coda𝑔))(2nd𝑓)) = ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓)))
1110oteq3d 4777 . . . . 5 (𝑐 = 𝐶 → ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩(comp‘𝑐)(coda𝑔))(2nd𝑓))⟩ = ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩)
124, 5, 11mpoeq123dv 7223 . . . 4 (𝑐 = 𝐶 → (𝑔 ∈ (Arrow‘𝑐), 𝑓 ∈ { ∈ (Arrow‘𝑐) ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩(comp‘𝑐)(coda𝑔))(2nd𝑓))⟩) = (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩))
13 df-coa 17382 . . . 4 compa = (𝑐 ∈ Cat ↦ (𝑔 ∈ (Arrow‘𝑐), 𝑓 ∈ { ∈ (Arrow‘𝑐) ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩(comp‘𝑐)(coda𝑔))(2nd𝑓))⟩))
143fvexi 6672 . . . . 5 𝐴 ∈ V
1514rabex 5202 . . . . 5 {𝐴 ∣ (coda) = (doma𝑔)} ∈ V
1614, 15mpoex 7782 . . . 4 (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩) ∈ V
1712, 13, 16fvmpt 6759 . . 3 (𝐶 ∈ Cat → (compa𝐶) = (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩))
1813fvmptndm 6789 . . . 4 𝐶 ∈ Cat → (compa𝐶) = ∅)
193arwrcl 17370 . . . . . . . 8 (𝑓𝐴𝐶 ∈ Cat)
2019con3i 157 . . . . . . 7 𝐶 ∈ Cat → ¬ 𝑓𝐴)
2120eq0rdv 4300 . . . . . 6 𝐶 ∈ Cat → 𝐴 = ∅)
22 eqidd 2759 . . . . . 6 𝐶 ∈ Cat → {𝐴 ∣ (coda) = (doma𝑔)} = {𝐴 ∣ (coda) = (doma𝑔)})
23 eqidd 2759 . . . . . 6 𝐶 ∈ Cat → ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩ = ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩)
2421, 22, 23mpoeq123dv 7223 . . . . 5 𝐶 ∈ Cat → (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩) = (𝑔 ∈ ∅, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩))
25 mpo0 7233 . . . . 5 (𝑔 ∈ ∅, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩) = ∅
2624, 25eqtrdi 2809 . . . 4 𝐶 ∈ Cat → (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩) = ∅)
2718, 26eqtr4d 2796 . . 3 𝐶 ∈ Cat → (compa𝐶) = (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩))
2817, 27pm2.61i 185 . 2 (compa𝐶) = (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩)
291, 28eqtri 2781 1 · = (𝑔𝐴, 𝑓 ∈ {𝐴 ∣ (coda) = (doma𝑔)} ↦ ⟨(doma𝑓), (coda𝑔), ((2nd𝑔)(⟨(doma𝑓), (doma𝑔)⟩ (coda𝑔))(2nd𝑓))⟩)
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   = wceq 1538   ∈ wcel 2111  {crab 3074  ∅c0 4225  ⟨cop 4528  ⟨cotp 4530  ‘cfv 6335  (class class class)co 7150   ∈ cmpo 7152  2nd c2nd 7692  compcco 16635  Catccat 16993  domacdoma 17346  codaccoda 17347  Arrowcarw 17348  compaccoa 17380 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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-rep 5156  ax-sep 5169  ax-nul 5176  ax-pow 5234  ax-pr 5298  ax-un 7459 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-reu 3077  df-rab 3079  df-v 3411  df-sbc 3697  df-csb 3806  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-nul 4226  df-if 4421  df-pw 4496  df-sn 4523  df-pr 4525  df-op 4529  df-ot 4531  df-uni 4799  df-iun 4885  df-br 5033  df-opab 5095  df-mpt 5113  df-id 5430  df-xp 5530  df-rel 5531  df-cnv 5532  df-co 5533  df-dm 5534  df-rn 5535  df-res 5536  df-ima 5537  df-iota 6294  df-fun 6337  df-fn 6338  df-f 6339  df-f1 6340  df-fo 6341  df-f1o 6342  df-fv 6343  df-ov 7153  df-oprab 7154  df-mpo 7155  df-1st 7693  df-2nd 7694  df-arw 17353  df-coa 17382 This theorem is referenced by:  eldmcoa  17391  dmcoass  17392  coaval  17394  coapm  17397
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