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Theorem subrg1cl 20465
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 2729 . . . 4 (Base‘𝑅) = (Base‘𝑅)
2 subrg1cl.a . . . 4 1 = (1r𝑅)
31, 2issubrg 20456 . . 3 (𝐴 ∈ (SubRing‘𝑅) ↔ ((𝑅 ∈ Ring ∧ (𝑅s 𝐴) ∈ Ring) ∧ (𝐴 ⊆ (Base‘𝑅) ∧ 1𝐴)))
43simprbi 496 . 2 (𝐴 ∈ (SubRing‘𝑅) → (𝐴 ⊆ (Base‘𝑅) ∧ 1𝐴))
54simprd 495 1 (𝐴 ∈ (SubRing‘𝑅) → 1𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1540  wcel 2109  wss 3903  cfv 6482  (class class class)co 7349  Basecbs 17120  s cress 17141  1rcur 20066  Ringcrg 20118  SubRingcsubrg 20454
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-mpt 5174  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-rn 5630  df-res 5631  df-ima 5632  df-iota 6438  df-fun 6484  df-fv 6490  df-ov 7352  df-subrg 20455
This theorem is referenced by:  subrg1  20467  subrgsubm  20470  issubrg2  20477  subrgint  20480  subsubrg  20483  primefld1cl  20692  zsssubrg  21332  issubassa2  21799  subrgpsr  21885  mplassa  21929  mplbas2  21947  ply1assa  22082  asclply1subcl  22259  evls1maprhm  22261  isclmp  24995  taylply2  26273  taylply2OLD  26274  subrgchr  33177  0ringsubrg  33191  fldgensdrg  33253  primefldgen1  33260  ressply1evls1  33500  drgextlsp  33560  fldgenfldext  33635  evls1fldgencl  33637  fldextrspundgdvdslem  33647  fldextrspundgdvds  33648  ply1annnr  33670  algextdeglem4  33687  rtelextdg2lem  33693  evlsmaprhm  42543  cnsrexpcl  43138  rngunsnply  43142
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