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Theorem subrg1cl 20664
Description: A subring contains the multiplicative identity. (Contributed by Stefan O'Rear, 27-Nov-2014.)
Hypothesis
Ref Expression
subrg1cl.a 1 = (1r𝑅)
Assertion
Ref Expression
subrg1cl (𝐴 ∈ (SubRing‘𝑅) → 1𝐴)

Proof of Theorem subrg1cl
StepHypRef Expression
1 eqid 2769 . . . 4 (Base‘𝑅) = (Base‘𝑅)
2 subrg1cl.a . . . 4 1 = (1r𝑅)
31, 2issubrg 20655 . . 3 (𝐴 ∈ (SubRing‘𝑅) ↔ ((𝑅 ∈ Ring ∧ (𝑅s 𝐴) ∈ Ring) ∧ (𝐴 ⊆ (Base‘𝑅) ∧ 1𝐴)))
43simprbi 502 . 2 (𝐴 ∈ (SubRing‘𝑅) → (𝐴 ⊆ (Base‘𝑅) ∧ 1𝐴))
54simprd 500 1 (𝐴 ∈ (SubRing‘𝑅) → 1𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 400   = wceq 1567  wcel 2149  wss 3913  cfv 6537  (class class class)co 7411  Basecbs 17268  s cress 17289  1rcur 20262  Ringcrg 20314  SubRingcsubrg 20653
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-nul 5271  ax-pow 5337  ax-pr 5405
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5557  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-ima 5675  df-iota 6493  df-fun 6539  df-fv 6545  df-ov 7414  df-subrg 20654
This theorem is referenced by:  subrg1  20666  subrgsubm  20669  issubrg2  20676  subrgint  20679  subsubrg  20682  primefld1cl  20887  zsssubrg  21543  issubassa2  22010  subrgpsr  22095  mplassa  22139  mplbas2  22161  evlsmaprhm  22250  ply1assa  22327  asclply1subcl  22502  evls1maprhm  22504  isclmp  25224  taylply2  26496  subrgchr  33496  0ringsubrg  33511  fldgensdrg  33577  primefldgen1  33584  ressply1evls1  33799  mplmonprod  33888  drgextlsp  33928  fldgenfldext  34002  evls1fldgencl  34004  fldextrspundgdvdslem  34014  fldextrspundgdvds  34015  ply1annnr  34037  algextdeglem4  34054  rtelextdg2lem  34060  cnsrexpcl  43783  rngunsnply  43787
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