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Theorem isrnghm 42457
Description: A function is a non-unital ring homomorphism iff it is a group homomorphism and preserves multiplication. (Contributed by AV, 22-Feb-2020.)
Hypotheses
Ref Expression
isrnghm.b 𝐵 = (Base‘𝑅)
isrnghm.t · = (.r𝑅)
isrnghm.m = (.r𝑆)
Assertion
Ref Expression
isrnghm (𝐹 ∈ (𝑅 RngHomo 𝑆) ↔ ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) ∧ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
Distinct variable groups:   𝑥,𝐵,𝑦   𝑥,𝑅,𝑦   𝑥,𝑆,𝑦   𝑥,𝐹,𝑦
Allowed substitution hints:   · (𝑥,𝑦)   (𝑥,𝑦)

Proof of Theorem isrnghm
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 rnghmrcl 42454 . 2 (𝐹 ∈ (𝑅 RngHomo 𝑆) → (𝑅 ∈ Rng ∧ 𝑆 ∈ Rng))
2 isrnghm.b . . . . 5 𝐵 = (Base‘𝑅)
3 isrnghm.t . . . . 5 · = (.r𝑅)
4 isrnghm.m . . . . 5 = (.r𝑆)
5 eqid 2806 . . . . 5 (Base‘𝑆) = (Base‘𝑆)
6 eqid 2806 . . . . 5 (+g𝑅) = (+g𝑅)
7 eqid 2806 . . . . 5 (+g𝑆) = (+g𝑆)
82, 3, 4, 5, 6, 7rnghmval 42456 . . . 4 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (𝑅 RngHomo 𝑆) = {𝑓 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∣ ∀𝑥𝐵𝑦𝐵 ((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ∧ (𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦)))})
98eleq2d 2871 . . 3 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (𝐹 ∈ (𝑅 RngHomo 𝑆) ↔ 𝐹 ∈ {𝑓 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∣ ∀𝑥𝐵𝑦𝐵 ((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ∧ (𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦)))}))
10 fveq1 6403 . . . . . . . 8 (𝑓 = 𝐹 → (𝑓‘(𝑥(+g𝑅)𝑦)) = (𝐹‘(𝑥(+g𝑅)𝑦)))
11 fveq1 6403 . . . . . . . . 9 (𝑓 = 𝐹 → (𝑓𝑥) = (𝐹𝑥))
12 fveq1 6403 . . . . . . . . 9 (𝑓 = 𝐹 → (𝑓𝑦) = (𝐹𝑦))
1311, 12oveq12d 6888 . . . . . . . 8 (𝑓 = 𝐹 → ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)))
1410, 13eqeq12d 2821 . . . . . . 7 (𝑓 = 𝐹 → ((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ↔ (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))))
15 fveq1 6403 . . . . . . . 8 (𝑓 = 𝐹 → (𝑓‘(𝑥 · 𝑦)) = (𝐹‘(𝑥 · 𝑦)))
1611, 12oveq12d 6888 . . . . . . . 8 (𝑓 = 𝐹 → ((𝑓𝑥) (𝑓𝑦)) = ((𝐹𝑥) (𝐹𝑦)))
1715, 16eqeq12d 2821 . . . . . . 7 (𝑓 = 𝐹 → ((𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦)) ↔ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦))))
1814, 17anbi12d 618 . . . . . 6 (𝑓 = 𝐹 → (((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ∧ (𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦))) ↔ ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
19182ralbidv 3177 . . . . 5 (𝑓 = 𝐹 → (∀𝑥𝐵𝑦𝐵 ((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ∧ (𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦))) ↔ ∀𝑥𝐵𝑦𝐵 ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
2019elrab 3559 . . . 4 (𝐹 ∈ {𝑓 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∣ ∀𝑥𝐵𝑦𝐵 ((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ∧ (𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦)))} ↔ (𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
21 r19.26-2 3253 . . . . . . 7 (∀𝑥𝐵𝑦𝐵 ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦))) ↔ (∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦))))
2221anbi2i 611 . . . . . 6 ((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))) ↔ (𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ (∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
23 anass 456 . . . . . 6 (((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦))) ↔ (𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ (∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
2422, 23bitr4i 269 . . . . 5 ((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))) ↔ ((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦))))
252, 5, 6, 7isghm 17858 . . . . . . 7 (𝐹 ∈ (𝑅 GrpHom 𝑆) ↔ ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) ∧ (𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)))))
26 fvex 6417 . . . . . . . . . . 11 (Base‘𝑆) ∈ V
272fvexi 6418 . . . . . . . . . . 11 𝐵 ∈ V
2826, 27pm3.2i 458 . . . . . . . . . 10 ((Base‘𝑆) ∈ V ∧ 𝐵 ∈ V)
29 elmapg 8101 . . . . . . . . . 10 (((Base‘𝑆) ∈ V ∧ 𝐵 ∈ V) → (𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ↔ 𝐹:𝐵⟶(Base‘𝑆)))
3028, 29mp1i 13 . . . . . . . . 9 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ↔ 𝐹:𝐵⟶(Base‘𝑆)))
3130anbi1d 617 . . . . . . . 8 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → ((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ↔ (𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)))))
32 rngabl 42442 . . . . . . . . . 10 (𝑅 ∈ Rng → 𝑅 ∈ Abel)
33 ablgrp 18395 . . . . . . . . . 10 (𝑅 ∈ Abel → 𝑅 ∈ Grp)
3432, 33syl 17 . . . . . . . . 9 (𝑅 ∈ Rng → 𝑅 ∈ Grp)
35 rngabl 42442 . . . . . . . . . 10 (𝑆 ∈ Rng → 𝑆 ∈ Abel)
36 ablgrp 18395 . . . . . . . . . 10 (𝑆 ∈ Abel → 𝑆 ∈ Grp)
3735, 36syl 17 . . . . . . . . 9 (𝑆 ∈ Rng → 𝑆 ∈ Grp)
38 ibar 520 . . . . . . . . 9 ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) → ((𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ↔ ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) ∧ (𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))))))
3934, 37, 38syl2an 585 . . . . . . . 8 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → ((𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ↔ ((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) ∧ (𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))))))
4031, 39bitr2d 271 . . . . . . 7 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (((𝑅 ∈ Grp ∧ 𝑆 ∈ Grp) ∧ (𝐹:𝐵⟶(Base‘𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)))) ↔ (𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)))))
4125, 40syl5rbb 275 . . . . . 6 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → ((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ↔ 𝐹 ∈ (𝑅 GrpHom 𝑆)))
4241anbi1d 617 . . . . 5 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦))) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦))) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
4324, 42syl5bb 274 . . . 4 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → ((𝐹 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∧ ∀𝑥𝐵𝑦𝐵 ((𝐹‘(𝑥(+g𝑅)𝑦)) = ((𝐹𝑥)(+g𝑆)(𝐹𝑦)) ∧ (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
4420, 43syl5bb 274 . . 3 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (𝐹 ∈ {𝑓 ∈ ((Base‘𝑆) ↑𝑚 𝐵) ∣ ∀𝑥𝐵𝑦𝐵 ((𝑓‘(𝑥(+g𝑅)𝑦)) = ((𝑓𝑥)(+g𝑆)(𝑓𝑦)) ∧ (𝑓‘(𝑥 · 𝑦)) = ((𝑓𝑥) (𝑓𝑦)))} ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
459, 44bitrd 270 . 2 ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) → (𝐹 ∈ (𝑅 RngHomo 𝑆) ↔ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
461, 45biadan2 844 1 (𝐹 ∈ (𝑅 RngHomo 𝑆) ↔ ((𝑅 ∈ Rng ∧ 𝑆 ∈ Rng) ∧ (𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ ∀𝑥𝐵𝑦𝐵 (𝐹‘(𝑥 · 𝑦)) = ((𝐹𝑥) (𝐹𝑦)))))
Colors of variables: wff setvar class
Syntax hints:  wb 197  wa 384   = wceq 1637  wcel 2156  wral 3096  {crab 3100  Vcvv 3391  wf 6093  cfv 6097  (class class class)co 6870  𝑚 cmap 8088  Basecbs 16064  +gcplusg 16149  .rcmulr 16150  Grpcgrp 17623   GrpHom cghm 17855  Abelcabl 18391  Rngcrng 42439   RngHomo crngh 42450
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1877  ax-4 1894  ax-5 2001  ax-6 2068  ax-7 2104  ax-8 2158  ax-9 2165  ax-10 2185  ax-11 2201  ax-12 2214  ax-13 2420  ax-ext 2784  ax-rep 4964  ax-sep 4975  ax-nul 4983  ax-pow 5035  ax-pr 5096  ax-un 7175
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 866  df-3an 1102  df-tru 1641  df-ex 1860  df-nf 1864  df-sb 2061  df-eu 2634  df-mo 2635  df-clab 2793  df-cleq 2799  df-clel 2802  df-nfc 2937  df-ne 2979  df-ral 3101  df-rex 3102  df-reu 3103  df-rab 3105  df-v 3393  df-sbc 3634  df-csb 3729  df-dif 3772  df-un 3774  df-in 3776  df-ss 3783  df-nul 4117  df-if 4280  df-pw 4353  df-sn 4371  df-pr 4373  df-op 4377  df-uni 4631  df-iun 4714  df-br 4845  df-opab 4907  df-mpt 4924  df-id 5219  df-xp 5317  df-rel 5318  df-cnv 5319  df-co 5320  df-dm 5321  df-rn 5322  df-res 5323  df-ima 5324  df-iota 6060  df-fun 6099  df-fn 6100  df-f 6101  df-f1 6102  df-fo 6103  df-f1o 6104  df-fv 6105  df-ov 6873  df-oprab 6874  df-mpt2 6875  df-map 8090  df-ghm 17856  df-abl 18393  df-rng0 42440  df-rnghomo 42452
This theorem is referenced by:  isrnghmmul  42458  rnghmghm  42463  rnghmmul  42465  isrnghm2d  42466  zrrnghm  42482
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