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Theorem ringcval 43644
Description: Value of the category of unital rings (in a universe). (Contributed by AV, 13-Feb-2020.) (Revised by AV, 8-Mar-2020.)
Hypotheses
Ref Expression
ringcval.c 𝐶 = (RingCat‘𝑈)
ringcval.u (𝜑𝑈𝑉)
ringcval.b (𝜑𝐵 = (𝑈 ∩ Ring))
ringcval.h (𝜑𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))
Assertion
Ref Expression
ringcval (𝜑𝐶 = ((ExtStrCat‘𝑈) ↾cat 𝐻))

Proof of Theorem ringcval
Dummy variable 𝑢 is distinct from all other variables.
StepHypRef Expression
1 ringcval.c . 2 𝐶 = (RingCat‘𝑈)
2 df-ringc 43641 . . 3 RingCat = (𝑢 ∈ V ↦ ((ExtStrCat‘𝑢) ↾cat ( RingHom ↾ ((𝑢 ∩ Ring) × (𝑢 ∩ Ring)))))
3 fveq2 6501 . . . . 5 (𝑢 = 𝑈 → (ExtStrCat‘𝑢) = (ExtStrCat‘𝑈))
43adantl 474 . . . 4 ((𝜑𝑢 = 𝑈) → (ExtStrCat‘𝑢) = (ExtStrCat‘𝑈))
5 ineq1 4070 . . . . . . . 8 (𝑢 = 𝑈 → (𝑢 ∩ Ring) = (𝑈 ∩ Ring))
65sqxpeqd 5440 . . . . . . 7 (𝑢 = 𝑈 → ((𝑢 ∩ Ring) × (𝑢 ∩ Ring)) = ((𝑈 ∩ Ring) × (𝑈 ∩ Ring)))
7 ringcval.b . . . . . . . . 9 (𝜑𝐵 = (𝑈 ∩ Ring))
87sqxpeqd 5440 . . . . . . . 8 (𝜑 → (𝐵 × 𝐵) = ((𝑈 ∩ Ring) × (𝑈 ∩ Ring)))
98eqcomd 2784 . . . . . . 7 (𝜑 → ((𝑈 ∩ Ring) × (𝑈 ∩ Ring)) = (𝐵 × 𝐵))
106, 9sylan9eqr 2836 . . . . . 6 ((𝜑𝑢 = 𝑈) → ((𝑢 ∩ Ring) × (𝑢 ∩ Ring)) = (𝐵 × 𝐵))
1110reseq2d 5696 . . . . 5 ((𝜑𝑢 = 𝑈) → ( RingHom ↾ ((𝑢 ∩ Ring) × (𝑢 ∩ Ring))) = ( RingHom ↾ (𝐵 × 𝐵)))
12 ringcval.h . . . . . . 7 (𝜑𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))
1312eqcomd 2784 . . . . . 6 (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) = 𝐻)
1413adantr 473 . . . . 5 ((𝜑𝑢 = 𝑈) → ( RingHom ↾ (𝐵 × 𝐵)) = 𝐻)
1511, 14eqtrd 2814 . . . 4 ((𝜑𝑢 = 𝑈) → ( RingHom ↾ ((𝑢 ∩ Ring) × (𝑢 ∩ Ring))) = 𝐻)
164, 15oveq12d 6996 . . 3 ((𝜑𝑢 = 𝑈) → ((ExtStrCat‘𝑢) ↾cat ( RingHom ↾ ((𝑢 ∩ Ring) × (𝑢 ∩ Ring)))) = ((ExtStrCat‘𝑈) ↾cat 𝐻))
17 ringcval.u . . . 4 (𝜑𝑈𝑉)
1817elexd 3435 . . 3 (𝜑𝑈 ∈ V)
19 ovexd 7012 . . 3 (𝜑 → ((ExtStrCat‘𝑈) ↾cat 𝐻) ∈ V)
202, 16, 18, 19fvmptd2 6604 . 2 (𝜑 → (RingCat‘𝑈) = ((ExtStrCat‘𝑈) ↾cat 𝐻))
211, 20syl5eq 2826 1 (𝜑𝐶 = ((ExtStrCat‘𝑈) ↾cat 𝐻))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 387   = wceq 1507  wcel 2050  Vcvv 3415  cin 3830   × cxp 5406  cres 5410  cfv 6190  (class class class)co 6978  cat cresc 16939  ExtStrCatcestrc 17233  Ringcrg 19023   RingHom crh 19190  RingCatcringc 43639
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1758  ax-4 1772  ax-5 1869  ax-6 1928  ax-7 1965  ax-8 2052  ax-9 2059  ax-10 2079  ax-11 2093  ax-12 2106  ax-13 2301  ax-ext 2750  ax-sep 5061  ax-nul 5068  ax-pr 5187
This theorem depends on definitions:  df-bi 199  df-an 388  df-or 834  df-3an 1070  df-tru 1510  df-ex 1743  df-nf 1747  df-sb 2016  df-mo 2547  df-eu 2583  df-clab 2759  df-cleq 2771  df-clel 2846  df-nfc 2918  df-ral 3093  df-rex 3094  df-rab 3097  df-v 3417  df-sbc 3684  df-csb 3789  df-dif 3834  df-un 3836  df-in 3838  df-ss 3845  df-nul 4181  df-if 4352  df-sn 4443  df-pr 4445  df-op 4449  df-uni 4714  df-br 4931  df-opab 4993  df-mpt 5010  df-id 5313  df-xp 5414  df-rel 5415  df-cnv 5416  df-co 5417  df-dm 5418  df-res 5420  df-iota 6154  df-fun 6192  df-fv 6198  df-ov 6981  df-ringc 43641
This theorem is referenced by:  ringcbas  43647  ringchomfval  43648  ringccofval  43652  dfringc2  43654  ringccat  43660  ringcid  43661  funcringcsetc  43671
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