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Theorem f1ghm0to0 13342
Description: If a group homomorphism 𝐹 is injective, it maps the zero of one group (and only the zero) to the zero of the other group. (Contributed by AV, 24-Oct-2019.) (Revised by Thierry Arnoux, 13-May-2023.)
Hypotheses
Ref Expression
f1ghm0to0.a 𝐴 = (Base‘𝑅)
f1ghm0to0.b 𝐵 = (Base‘𝑆)
f1ghm0to0.n 𝑁 = (0g𝑅)
f1ghm0to0.0 0 = (0g𝑆)
Assertion
Ref Expression
f1ghm0to0 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → ((𝐹𝑋) = 0𝑋 = 𝑁))

Proof of Theorem f1ghm0to0
StepHypRef Expression
1 f1ghm0to0.n . . . . . 6 𝑁 = (0g𝑅)
2 f1ghm0to0.0 . . . . . 6 0 = (0g𝑆)
31, 2ghmid 13319 . . . . 5 (𝐹 ∈ (𝑅 GrpHom 𝑆) → (𝐹𝑁) = 0 )
433ad2ant1 1020 . . . 4 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → (𝐹𝑁) = 0 )
54eqeq2d 2205 . . 3 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → ((𝐹𝑋) = (𝐹𝑁) ↔ (𝐹𝑋) = 0 ))
6 simp2 1000 . . . 4 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → 𝐹:𝐴1-1𝐵)
7 simp3 1001 . . . 4 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → 𝑋𝐴)
8 ghmgrp1 13315 . . . . . 6 (𝐹 ∈ (𝑅 GrpHom 𝑆) → 𝑅 ∈ Grp)
9 f1ghm0to0.a . . . . . . 7 𝐴 = (Base‘𝑅)
109, 1grpidcl 13101 . . . . . 6 (𝑅 ∈ Grp → 𝑁𝐴)
118, 10syl 14 . . . . 5 (𝐹 ∈ (𝑅 GrpHom 𝑆) → 𝑁𝐴)
12113ad2ant1 1020 . . . 4 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → 𝑁𝐴)
13 f1veqaeq 5812 . . . 4 ((𝐹:𝐴1-1𝐵 ∧ (𝑋𝐴𝑁𝐴)) → ((𝐹𝑋) = (𝐹𝑁) → 𝑋 = 𝑁))
146, 7, 12, 13syl12anc 1247 . . 3 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → ((𝐹𝑋) = (𝐹𝑁) → 𝑋 = 𝑁))
155, 14sylbird 170 . 2 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → ((𝐹𝑋) = 0𝑋 = 𝑁))
16 fveq2 5554 . . . 4 (𝑋 = 𝑁 → (𝐹𝑋) = (𝐹𝑁))
1716, 4sylan9eqr 2248 . . 3 (((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) ∧ 𝑋 = 𝑁) → (𝐹𝑋) = 0 )
1817ex 115 . 2 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → (𝑋 = 𝑁 → (𝐹𝑋) = 0 ))
1915, 18impbid 129 1 ((𝐹 ∈ (𝑅 GrpHom 𝑆) ∧ 𝐹:𝐴1-1𝐵𝑋𝐴) → ((𝐹𝑋) = 0𝑋 = 𝑁))
Colors of variables: wff set class
Syntax hints:  wi 4  wb 105  w3a 980   = wceq 1364  wcel 2164  1-1wf1 5251  cfv 5254  (class class class)co 5918  Basecbs 12618  0gc0g 12867  Grpcgrp 13072   GrpHom cghm 13310
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-coll 4144  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464  ax-setind 4569  ax-cnex 7963  ax-resscn 7964  ax-1re 7966  ax-addrcl 7969
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-ral 2477  df-rex 2478  df-reu 2479  df-rmo 2480  df-rab 2481  df-v 2762  df-sbc 2986  df-csb 3081  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-int 3871  df-iun 3914  df-br 4030  df-opab 4091  df-mpt 4092  df-id 4324  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-rn 4670  df-res 4671  df-ima 4672  df-iota 5215  df-fun 5256  df-fn 5257  df-f 5258  df-f1 5259  df-fo 5260  df-f1o 5261  df-fv 5262  df-riota 5873  df-ov 5921  df-oprab 5922  df-mpo 5923  df-inn 8983  df-2 9041  df-ndx 12621  df-slot 12622  df-base 12624  df-plusg 12708  df-0g 12869  df-mgm 12939  df-sgrp 12985  df-mnd 12998  df-grp 13075  df-ghm 13311
This theorem is referenced by:  ghmf1  13343  kerf1ghm  13344
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