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Theorem ghmsub 17491
Description: Linearity of subtraction through a group homomorphism. (Contributed by Stefan O'Rear, 31-Dec-2014.)
Hypotheses
Ref Expression
ghmsub.b 𝐵 = (Base‘𝑆)
ghmsub.m = (-g𝑆)
ghmsub.n 𝑁 = (-g𝑇)
Assertion
Ref Expression
ghmsub ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → (𝐹‘(𝑈 𝑉)) = ((𝐹𝑈)𝑁(𝐹𝑉)))

Proof of Theorem ghmsub
StepHypRef Expression
1 ghmgrp1 17485 . . . . . 6 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝑆 ∈ Grp)
213ad2ant1 1075 . . . . 5 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → 𝑆 ∈ Grp)
3 simp3 1056 . . . . 5 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → 𝑉𝐵)
4 ghmsub.b . . . . . 6 𝐵 = (Base‘𝑆)
5 eqid 2610 . . . . . 6 (invg𝑆) = (invg𝑆)
64, 5grpinvcl 17290 . . . . 5 ((𝑆 ∈ Grp ∧ 𝑉𝐵) → ((invg𝑆)‘𝑉) ∈ 𝐵)
72, 3, 6syl2anc 691 . . . 4 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → ((invg𝑆)‘𝑉) ∈ 𝐵)
8 eqid 2610 . . . . 5 (+g𝑆) = (+g𝑆)
9 eqid 2610 . . . . 5 (+g𝑇) = (+g𝑇)
104, 8, 9ghmlin 17488 . . . 4 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵 ∧ ((invg𝑆)‘𝑉) ∈ 𝐵) → (𝐹‘(𝑈(+g𝑆)((invg𝑆)‘𝑉))) = ((𝐹𝑈)(+g𝑇)(𝐹‘((invg𝑆)‘𝑉))))
117, 10syld3an3 1363 . . 3 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → (𝐹‘(𝑈(+g𝑆)((invg𝑆)‘𝑉))) = ((𝐹𝑈)(+g𝑇)(𝐹‘((invg𝑆)‘𝑉))))
12 eqid 2610 . . . . . 6 (invg𝑇) = (invg𝑇)
134, 5, 12ghminv 17490 . . . . 5 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑉𝐵) → (𝐹‘((invg𝑆)‘𝑉)) = ((invg𝑇)‘(𝐹𝑉)))
14133adant2 1073 . . . 4 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → (𝐹‘((invg𝑆)‘𝑉)) = ((invg𝑇)‘(𝐹𝑉)))
1514oveq2d 6565 . . 3 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → ((𝐹𝑈)(+g𝑇)(𝐹‘((invg𝑆)‘𝑉))) = ((𝐹𝑈)(+g𝑇)((invg𝑇)‘(𝐹𝑉))))
1611, 15eqtrd 2644 . 2 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → (𝐹‘(𝑈(+g𝑆)((invg𝑆)‘𝑉))) = ((𝐹𝑈)(+g𝑇)((invg𝑇)‘(𝐹𝑉))))
17 ghmsub.m . . . . 5 = (-g𝑆)
184, 8, 5, 17grpsubval 17288 . . . 4 ((𝑈𝐵𝑉𝐵) → (𝑈 𝑉) = (𝑈(+g𝑆)((invg𝑆)‘𝑉)))
1918fveq2d 6107 . . 3 ((𝑈𝐵𝑉𝐵) → (𝐹‘(𝑈 𝑉)) = (𝐹‘(𝑈(+g𝑆)((invg𝑆)‘𝑉))))
20193adant1 1072 . 2 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → (𝐹‘(𝑈 𝑉)) = (𝐹‘(𝑈(+g𝑆)((invg𝑆)‘𝑉))))
21 eqid 2610 . . . . . 6 (Base‘𝑇) = (Base‘𝑇)
224, 21ghmf 17487 . . . . 5 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝐹:𝐵⟶(Base‘𝑇))
23 ffvelrn 6265 . . . . . 6 ((𝐹:𝐵⟶(Base‘𝑇) ∧ 𝑈𝐵) → (𝐹𝑈) ∈ (Base‘𝑇))
24 ffvelrn 6265 . . . . . 6 ((𝐹:𝐵⟶(Base‘𝑇) ∧ 𝑉𝐵) → (𝐹𝑉) ∈ (Base‘𝑇))
2523, 24anim12dan 878 . . . . 5 ((𝐹:𝐵⟶(Base‘𝑇) ∧ (𝑈𝐵𝑉𝐵)) → ((𝐹𝑈) ∈ (Base‘𝑇) ∧ (𝐹𝑉) ∈ (Base‘𝑇)))
2622, 25sylan 487 . . . 4 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ (𝑈𝐵𝑉𝐵)) → ((𝐹𝑈) ∈ (Base‘𝑇) ∧ (𝐹𝑉) ∈ (Base‘𝑇)))
27263impb 1252 . . 3 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → ((𝐹𝑈) ∈ (Base‘𝑇) ∧ (𝐹𝑉) ∈ (Base‘𝑇)))
28 ghmsub.n . . . 4 𝑁 = (-g𝑇)
2921, 9, 12, 28grpsubval 17288 . . 3 (((𝐹𝑈) ∈ (Base‘𝑇) ∧ (𝐹𝑉) ∈ (Base‘𝑇)) → ((𝐹𝑈)𝑁(𝐹𝑉)) = ((𝐹𝑈)(+g𝑇)((invg𝑇)‘(𝐹𝑉))))
3027, 29syl 17 . 2 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → ((𝐹𝑈)𝑁(𝐹𝑉)) = ((𝐹𝑈)(+g𝑇)((invg𝑇)‘(𝐹𝑉))))
3116, 20, 303eqtr4d 2654 1 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑈𝐵𝑉𝐵) → (𝐹‘(𝑈 𝑉)) = ((𝐹𝑈)𝑁(𝐹𝑉)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 383  w3a 1031   = wceq 1475  wcel 1977  wf 5800  cfv 5804  (class class class)co 6549  Basecbs 15695  +gcplusg 15768  Grpcgrp 17245  invgcminusg 17246  -gcsg 17247   GrpHom cghm 17480
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060  df-0g 15925  df-mgm 17065  df-sgrp 17107  df-mnd 17118  df-grp 17248  df-minusg 17249  df-sbg 17250  df-ghm 17481
This theorem is referenced by:  ghmnsgima  17507  ghmnsgpreima  17508  ghmeqker  17510  ghmf1  17512  evl1subd  19527  ghmcnp  21728  nmods  22358  qqhucn  29364
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