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Theorem ghmid 18364
 Description: A homomorphism of groups preserves the identity. (Contributed by Stefan O'Rear, 31-Dec-2014.)
Hypotheses
Ref Expression
ghmid.y 𝑌 = (0g𝑆)
ghmid.z 0 = (0g𝑇)
Assertion
Ref Expression
ghmid (𝐹 ∈ (𝑆 GrpHom 𝑇) → (𝐹𝑌) = 0 )

Proof of Theorem ghmid
StepHypRef Expression
1 ghmgrp1 18360 . . . . . 6 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝑆 ∈ Grp)
2 eqid 2824 . . . . . . 7 (Base‘𝑆) = (Base‘𝑆)
3 ghmid.y . . . . . . 7 𝑌 = (0g𝑆)
42, 3grpidcl 18131 . . . . . 6 (𝑆 ∈ Grp → 𝑌 ∈ (Base‘𝑆))
51, 4syl 17 . . . . 5 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝑌 ∈ (Base‘𝑆))
6 eqid 2824 . . . . . 6 (+g𝑆) = (+g𝑆)
7 eqid 2824 . . . . . 6 (+g𝑇) = (+g𝑇)
82, 6, 7ghmlin 18363 . . . . 5 ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑌 ∈ (Base‘𝑆) ∧ 𝑌 ∈ (Base‘𝑆)) → (𝐹‘(𝑌(+g𝑆)𝑌)) = ((𝐹𝑌)(+g𝑇)(𝐹𝑌)))
95, 5, 8mpd3an23 1460 . . . 4 (𝐹 ∈ (𝑆 GrpHom 𝑇) → (𝐹‘(𝑌(+g𝑆)𝑌)) = ((𝐹𝑌)(+g𝑇)(𝐹𝑌)))
102, 6, 3grplid 18133 . . . . . 6 ((𝑆 ∈ Grp ∧ 𝑌 ∈ (Base‘𝑆)) → (𝑌(+g𝑆)𝑌) = 𝑌)
111, 5, 10syl2anc 587 . . . . 5 (𝐹 ∈ (𝑆 GrpHom 𝑇) → (𝑌(+g𝑆)𝑌) = 𝑌)
1211fveq2d 6665 . . . 4 (𝐹 ∈ (𝑆 GrpHom 𝑇) → (𝐹‘(𝑌(+g𝑆)𝑌)) = (𝐹𝑌))
139, 12eqtr3d 2861 . . 3 (𝐹 ∈ (𝑆 GrpHom 𝑇) → ((𝐹𝑌)(+g𝑇)(𝐹𝑌)) = (𝐹𝑌))
14 ghmgrp2 18361 . . . 4 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝑇 ∈ Grp)
15 eqid 2824 . . . . . 6 (Base‘𝑇) = (Base‘𝑇)
162, 15ghmf 18362 . . . . 5 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 𝐹:(Base‘𝑆)⟶(Base‘𝑇))
1716, 5ffvelrnd 6843 . . . 4 (𝐹 ∈ (𝑆 GrpHom 𝑇) → (𝐹𝑌) ∈ (Base‘𝑇))
18 ghmid.z . . . . 5 0 = (0g𝑇)
1915, 7, 18grpid 18139 . . . 4 ((𝑇 ∈ Grp ∧ (𝐹𝑌) ∈ (Base‘𝑇)) → (((𝐹𝑌)(+g𝑇)(𝐹𝑌)) = (𝐹𝑌) ↔ 0 = (𝐹𝑌)))
2014, 17, 19syl2anc 587 . . 3 (𝐹 ∈ (𝑆 GrpHom 𝑇) → (((𝐹𝑌)(+g𝑇)(𝐹𝑌)) = (𝐹𝑌) ↔ 0 = (𝐹𝑌)))
2113, 20mpbid 235 . 2 (𝐹 ∈ (𝑆 GrpHom 𝑇) → 0 = (𝐹𝑌))
2221eqcomd 2830 1 (𝐹 ∈ (𝑆 GrpHom 𝑇) → (𝐹𝑌) = 0 )
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 209   = wceq 1538   ∈ wcel 2115  ‘cfv 6343  (class class class)co 7149  Basecbs 16483  +gcplusg 16565  0gc0g 16713  Grpcgrp 18103   GrpHom cghm 18355 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 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-rep 5176  ax-sep 5189  ax-nul 5196  ax-pow 5253  ax-pr 5317  ax-un 7455 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3015  df-ral 3138  df-rex 3139  df-reu 3140  df-rmo 3141  df-rab 3142  df-v 3482  df-sbc 3759  df-csb 3867  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-nul 4277  df-if 4451  df-pw 4524  df-sn 4551  df-pr 4553  df-op 4557  df-uni 4825  df-iun 4907  df-br 5053  df-opab 5115  df-mpt 5133  df-id 5447  df-xp 5548  df-rel 5549  df-cnv 5550  df-co 5551  df-dm 5552  df-rn 5553  df-res 5554  df-ima 5555  df-iota 6302  df-fun 6345  df-fn 6346  df-f 6347  df-f1 6348  df-fo 6349  df-f1o 6350  df-fv 6351  df-riota 7107  df-ov 7152  df-oprab 7153  df-mpo 7154  df-0g 16715  df-mgm 17852  df-sgrp 17901  df-mnd 17912  df-grp 18106  df-ghm 18356 This theorem is referenced by:  ghminv  18365  ghmmhm  18368  ghmpreima  18380  ghmf1  18387  lactghmga  18533  f1ghm0to0  19495  f1rhm0to0ALT  19496  kerf1ghm  19498  srng0  19631  islmhm2  19810  evlslem2  20292  evlslem3  20293  evlslem6  20294  zrh0  20661  chrrhm  20678  zndvds0  20697  ip0l  20780  0mat2pmat  21344  nmolb2d  23327  nmoi  23337  nmoix  23338  nmoleub  23340  nmoleub2lem2  23724  nmhmcn  23728  dchrptlem2  25852  psgnid  30771  dimkerim  31083  nrhmzr  44423  zrinitorngc  44550
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