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Theorem crngohomfo 33935
Description: The image of a homomorphism from a commutative ring is commutative. (Contributed by Jeff Madsen, 4-Jan-2011.)
Hypotheses
Ref Expression
crnghomfo.1 𝐺 = (1st𝑅)
crnghomfo.2 𝑋 = ran 𝐺
crnghomfo.3 𝐽 = (1st𝑆)
crnghomfo.4 𝑌 = ran 𝐽
Assertion
Ref Expression
crngohomfo (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → 𝑆 ∈ CRingOps)

Proof of Theorem crngohomfo
Dummy variables 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simplr 807 . 2 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → 𝑆 ∈ RingOps)
2 foelrn 6418 . . . . . . . 8 ((𝐹:𝑋onto𝑌𝑦𝑌) → ∃𝑤𝑋 𝑦 = (𝐹𝑤))
32ex 449 . . . . . . 7 (𝐹:𝑋onto𝑌 → (𝑦𝑌 → ∃𝑤𝑋 𝑦 = (𝐹𝑤)))
4 foelrn 6418 . . . . . . . 8 ((𝐹:𝑋onto𝑌𝑧𝑌) → ∃𝑥𝑋 𝑧 = (𝐹𝑥))
54ex 449 . . . . . . 7 (𝐹:𝑋onto𝑌 → (𝑧𝑌 → ∃𝑥𝑋 𝑧 = (𝐹𝑥)))
63, 5anim12d 585 . . . . . 6 (𝐹:𝑋onto𝑌 → ((𝑦𝑌𝑧𝑌) → (∃𝑤𝑋 𝑦 = (𝐹𝑤) ∧ ∃𝑥𝑋 𝑧 = (𝐹𝑥))))
7 reeanv 3136 . . . . . 6 (∃𝑤𝑋𝑥𝑋 (𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) ↔ (∃𝑤𝑋 𝑦 = (𝐹𝑤) ∧ ∃𝑥𝑋 𝑧 = (𝐹𝑥)))
86, 7syl6ibr 242 . . . . 5 (𝐹:𝑋onto𝑌 → ((𝑦𝑌𝑧𝑌) → ∃𝑤𝑋𝑥𝑋 (𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥))))
98ad2antll 765 . . . 4 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → ((𝑦𝑌𝑧𝑌) → ∃𝑤𝑋𝑥𝑋 (𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥))))
10 crnghomfo.1 . . . . . . . . . . . . . 14 𝐺 = (1st𝑅)
11 eqid 2651 . . . . . . . . . . . . . 14 (2nd𝑅) = (2nd𝑅)
12 crnghomfo.2 . . . . . . . . . . . . . 14 𝑋 = ran 𝐺
1310, 11, 12crngocom 33930 . . . . . . . . . . . . 13 ((𝑅 ∈ CRingOps ∧ 𝑤𝑋𝑥𝑋) → (𝑤(2nd𝑅)𝑥) = (𝑥(2nd𝑅)𝑤))
14133expb 1285 . . . . . . . . . . . 12 ((𝑅 ∈ CRingOps ∧ (𝑤𝑋𝑥𝑋)) → (𝑤(2nd𝑅)𝑥) = (𝑥(2nd𝑅)𝑤))
15143ad2antl1 1243 . . . . . . . . . . 11 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → (𝑤(2nd𝑅)𝑥) = (𝑥(2nd𝑅)𝑤))
1615fveq2d 6233 . . . . . . . . . 10 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → (𝐹‘(𝑤(2nd𝑅)𝑥)) = (𝐹‘(𝑥(2nd𝑅)𝑤)))
17 crngorngo 33929 . . . . . . . . . . 11 (𝑅 ∈ CRingOps → 𝑅 ∈ RingOps)
18 eqid 2651 . . . . . . . . . . . 12 (2nd𝑆) = (2nd𝑆)
1910, 12, 11, 18rngohommul 33899 . . . . . . . . . . 11 (((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → (𝐹‘(𝑤(2nd𝑅)𝑥)) = ((𝐹𝑤)(2nd𝑆)(𝐹𝑥)))
2017, 19syl3anl1 1414 . . . . . . . . . 10 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → (𝐹‘(𝑤(2nd𝑅)𝑥)) = ((𝐹𝑤)(2nd𝑆)(𝐹𝑥)))
2110, 12, 11, 18rngohommul 33899 . . . . . . . . . . . 12 (((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑥𝑋𝑤𝑋)) → (𝐹‘(𝑥(2nd𝑅)𝑤)) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤)))
2221ancom2s 861 . . . . . . . . . . 11 (((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → (𝐹‘(𝑥(2nd𝑅)𝑤)) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤)))
2317, 22syl3anl1 1414 . . . . . . . . . 10 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → (𝐹‘(𝑥(2nd𝑅)𝑤)) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤)))
2416, 20, 233eqtr3d 2693 . . . . . . . . 9 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → ((𝐹𝑤)(2nd𝑆)(𝐹𝑥)) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤)))
25 oveq12 6699 . . . . . . . . . 10 ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑦(2nd𝑆)𝑧) = ((𝐹𝑤)(2nd𝑆)(𝐹𝑥)))
26 oveq12 6699 . . . . . . . . . . 11 ((𝑧 = (𝐹𝑥) ∧ 𝑦 = (𝐹𝑤)) → (𝑧(2nd𝑆)𝑦) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤)))
2726ancoms 468 . . . . . . . . . 10 ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑧(2nd𝑆)𝑦) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤)))
2825, 27eqeq12d 2666 . . . . . . . . 9 ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → ((𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦) ↔ ((𝐹𝑤)(2nd𝑆)(𝐹𝑥)) = ((𝐹𝑥)(2nd𝑆)(𝐹𝑤))))
2924, 28syl5ibrcom 237 . . . . . . . 8 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) ∧ (𝑤𝑋𝑥𝑋)) → ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦)))
3029ex 449 . . . . . . 7 ((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → ((𝑤𝑋𝑥𝑋) → ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦))))
31303expa 1284 . . . . . 6 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → ((𝑤𝑋𝑥𝑋) → ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦))))
3231adantrr 753 . . . . 5 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → ((𝑤𝑋𝑥𝑋) → ((𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦))))
3332rexlimdvv 3066 . . . 4 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → (∃𝑤𝑋𝑥𝑋 (𝑦 = (𝐹𝑤) ∧ 𝑧 = (𝐹𝑥)) → (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦)))
349, 33syld 47 . . 3 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → ((𝑦𝑌𝑧𝑌) → (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦)))
3534ralrimivv 2999 . 2 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → ∀𝑦𝑌𝑧𝑌 (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦))
36 crnghomfo.3 . . 3 𝐽 = (1st𝑆)
37 crnghomfo.4 . . 3 𝑌 = ran 𝐽
3836, 18, 37iscrngo2 33926 . 2 (𝑆 ∈ CRingOps ↔ (𝑆 ∈ RingOps ∧ ∀𝑦𝑌𝑧𝑌 (𝑦(2nd𝑆)𝑧) = (𝑧(2nd𝑆)𝑦)))
391, 35, 38sylanbrc 699 1 (((𝑅 ∈ CRingOps ∧ 𝑆 ∈ RingOps) ∧ (𝐹 ∈ (𝑅 RngHom 𝑆) ∧ 𝐹:𝑋onto𝑌)) → 𝑆 ∈ CRingOps)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383  w3a 1054   = wceq 1523  wcel 2030  wral 2941  wrex 2942  ran crn 5144  ontowfo 5924  cfv 5926  (class class class)co 6690  1st c1st 7208  2nd c2nd 7209  RingOpscrngo 33823   RngHom crnghom 33889  CRingOpsccring 33922
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ral 2946  df-rex 2947  df-rab 2950  df-v 3233  df-sbc 3469  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-fo 5932  df-fv 5934  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-1st 7210  df-2nd 7211  df-map 7901  df-rngo 33824  df-rngohom 33892  df-com2 33919  df-crngo 33923
This theorem is referenced by: (None)
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