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Theorem rngokerinj 35371
Description: A ring homomorphism is injective if and only if its kernel is zero. (Contributed by Jeff Madsen, 16-Jun-2011.)
Hypotheses
Ref Expression
rngkerinj.1 𝐺 = (1st𝑅)
rngkerinj.2 𝑋 = ran 𝐺
rngkerinj.3 𝑊 = (GId‘𝐺)
rngkerinj.4 𝐽 = (1st𝑆)
rngkerinj.5 𝑌 = ran 𝐽
rngkerinj.6 𝑍 = (GId‘𝐽)
Assertion
Ref Expression
rngokerinj ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → (𝐹:𝑋1-1𝑌 ↔ (𝐹 “ {𝑍}) = {𝑊}))

Proof of Theorem rngokerinj
StepHypRef Expression
1 eqid 2822 . . . 4 (1st𝑅) = (1st𝑅)
21rngogrpo 35306 . . 3 (𝑅 ∈ RingOps → (1st𝑅) ∈ GrpOp)
323ad2ant1 1130 . 2 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → (1st𝑅) ∈ GrpOp)
4 eqid 2822 . . . 4 (1st𝑆) = (1st𝑆)
54rngogrpo 35306 . . 3 (𝑆 ∈ RingOps → (1st𝑆) ∈ GrpOp)
653ad2ant2 1131 . 2 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → (1st𝑆) ∈ GrpOp)
71, 4rngogrphom 35367 . 2 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → 𝐹 ∈ ((1st𝑅) GrpOpHom (1st𝑆)))
8 rngkerinj.2 . . . 4 𝑋 = ran 𝐺
9 rngkerinj.1 . . . . 5 𝐺 = (1st𝑅)
109rneqi 5784 . . . 4 ran 𝐺 = ran (1st𝑅)
118, 10eqtri 2845 . . 3 𝑋 = ran (1st𝑅)
12 rngkerinj.3 . . . 4 𝑊 = (GId‘𝐺)
139fveq2i 6655 . . . 4 (GId‘𝐺) = (GId‘(1st𝑅))
1412, 13eqtri 2845 . . 3 𝑊 = (GId‘(1st𝑅))
15 rngkerinj.5 . . . 4 𝑌 = ran 𝐽
16 rngkerinj.4 . . . . 5 𝐽 = (1st𝑆)
1716rneqi 5784 . . . 4 ran 𝐽 = ran (1st𝑆)
1815, 17eqtri 2845 . . 3 𝑌 = ran (1st𝑆)
19 rngkerinj.6 . . . 4 𝑍 = (GId‘𝐽)
2016fveq2i 6655 . . . 4 (GId‘𝐽) = (GId‘(1st𝑆))
2119, 20eqtri 2845 . . 3 𝑍 = (GId‘(1st𝑆))
2211, 14, 18, 21grpokerinj 35289 . 2 (((1st𝑅) ∈ GrpOp ∧ (1st𝑆) ∈ GrpOp ∧ 𝐹 ∈ ((1st𝑅) GrpOpHom (1st𝑆))) → (𝐹:𝑋1-1𝑌 ↔ (𝐹 “ {𝑍}) = {𝑊}))
233, 6, 7, 22syl3anc 1368 1 ((𝑅 ∈ RingOps ∧ 𝑆 ∈ RingOps ∧ 𝐹 ∈ (𝑅 RngHom 𝑆)) → (𝐹:𝑋1-1𝑌 ↔ (𝐹 “ {𝑍}) = {𝑊}))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  w3a 1084   = wceq 1538  wcel 2114  {csn 4539  ccnv 5531  ran crn 5533  cima 5535  1-1wf1 6331  cfv 6334  (class class class)co 7140  1st c1st 7673  GrpOpcgr 28270  GIdcgi 28271   GrpOpHom cghomOLD 35279  RingOpscrngo 35290   RngHom crnghom 35356
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 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2178  ax-ext 2794  ax-rep 5166  ax-sep 5179  ax-nul 5186  ax-pow 5243  ax-pr 5307  ax-un 7446
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 2070  df-mo 2622  df-eu 2653  df-clab 2801  df-cleq 2815  df-clel 2894  df-nfc 2962  df-ne 3012  df-ral 3135  df-rex 3136  df-reu 3137  df-rab 3139  df-v 3471  df-sbc 3748  df-csb 3856  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4266  df-if 4440  df-pw 4513  df-sn 4540  df-pr 4542  df-op 4546  df-uni 4814  df-iun 4896  df-br 5043  df-opab 5105  df-mpt 5123  df-id 5437  df-xp 5538  df-rel 5539  df-cnv 5540  df-co 5541  df-dm 5542  df-rn 5543  df-res 5544  df-ima 5545  df-iota 6293  df-fun 6336  df-fn 6337  df-f 6338  df-f1 6339  df-fo 6340  df-f1o 6341  df-fv 6342  df-riota 7098  df-ov 7143  df-oprab 7144  df-mpo 7145  df-1st 7675  df-2nd 7676  df-map 8395  df-grpo 28274  df-gid 28275  df-ginv 28276  df-gdiv 28277  df-ablo 28326  df-ghomOLD 35280  df-rngo 35291  df-rngohom 35359
This theorem is referenced by: (None)
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