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Theorem rngohom0 33742
 Description: A ring homomorphism preserves 0. (Contributed by Jeff Madsen, 2-Jan-2011.)
Hypotheses
Ref Expression
rnghom0.1 𝐺 = (1st𝑅)
rnghom0.2 𝑍 = (GId‘𝐺)
rnghom0.3 𝐽 = (1st𝑆)
rnghom0.4 𝑊 = (GId‘𝐽)
Assertion
Ref Expression
rngohom0 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → (𝐹𝑍) = 𝑊)

Proof of Theorem rngohom0
StepHypRef Expression
1 rnghom0.1 . . . 4 𝐺 = (1st𝑅)
21rngogrpo 33680 . . 3 (𝑅 ∈ RingOps → 𝐺 ∈ GrpOp)
323ad2ant1 1080 . 2 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → 𝐺 ∈ GrpOp)
4 rnghom0.3 . . . 4 𝐽 = (1st𝑆)
54rngogrpo 33680 . . 3 (𝑆 ∈ RingOps → 𝐽 ∈ GrpOp)
653ad2ant2 1081 . 2 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → 𝐽 ∈ GrpOp)
71, 4rngogrphom 33741 . 2 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → 𝐹 ∈ (𝐺 GrpOpHom 𝐽))
8 rnghom0.2 . . 3 𝑍 = (GId‘𝐺)
9 rnghom0.4 . . 3 𝑊 = (GId‘𝐽)
108, 9ghomidOLD 33659 . 2 ((𝐺 ∈ GrpOp ∧ 𝐽 ∈ GrpOp ∧ 𝐹 ∈ (𝐺 GrpOpHom 𝐽)) → (𝐹𝑍) = 𝑊)
113, 6, 7, 10syl3anc 1324 1 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → (𝐹𝑍) = 𝑊)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ w3a 1036   = wceq 1481   ∈ wcel 1988  ‘cfv 5876  (class class class)co 6635  1st c1st 7151  GrpOpcgr 27313  GIdcgi 27314   GrpOpHom cghomOLD 33653  RingOpscrngo 33664   RngHom crnghom 33730 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-8 1990  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-rep 4762  ax-sep 4772  ax-nul 4780  ax-pow 4834  ax-pr 4897  ax-un 6934 This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-ral 2914  df-rex 2915  df-reu 2916  df-rab 2918  df-v 3197  df-sbc 3430  df-csb 3527  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-op 4175  df-uni 4428  df-iun 4513  df-br 4645  df-opab 4704  df-mpt 4721  df-id 5014  df-xp 5110  df-rel 5111  df-cnv 5112  df-co 5113  df-dm 5114  df-rn 5115  df-res 5116  df-ima 5117  df-iota 5839  df-fun 5878  df-fn 5879  df-f 5880  df-f1 5881  df-fo 5882  df-f1o 5883  df-fv 5884  df-riota 6596  df-ov 6638  df-oprab 6639  df-mpt2 6640  df-1st 7153  df-2nd 7154  df-map 7844  df-grpo 27317  df-gid 27318  df-ablo 27369  df-ghomOLD 33654  df-rngo 33665  df-rngohom 33733 This theorem is referenced by:  keridl  33802
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