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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 3911  cfv 6499  (class class class)co 7369  Basecbs 17155  s cress 17176  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 5246  ax-nul 5256  ax-pow 5315  ax-pr 5382
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 3403  df-v 3446  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4293  df-if 4485  df-pw 4561  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-br 5103  df-opab 5165  df-mpt 5184  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6452  df-fun 6501  df-fv 6507  df-ov 7372  df-subrg 20455
This theorem is referenced by:  subrg1  20467  subrgsubm  20470  issubrg2  20477  subrgint  20480  subsubrg  20483  primefld1cl  20692  zsssubrg  21318  issubassa2  21777  subrgpsr  21863  mplassa  21907  mplbas2  21925  ply1assa  22060  asclply1subcl  22237  evls1maprhm  22239  isclmp  24973  taylply2  26251  taylply2OLD  26252  subrgchr  33161  0ringsubrg  33175  fldgensdrg  33237  primefldgen1  33244  ressply1evls1  33507  drgextlsp  33562  fldgenfldext  33636  evls1fldgencl  33638  fldextrspundgdvdslem  33648  fldextrspundgdvds  33649  ply1annnr  33666  algextdeglem4  33683  rtelextdg2lem  33689  evlsmaprhm  42531  cnsrexpcl  43127  rngunsnply  43131
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