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Theorem subrg1cl 14510
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 2238 . . . 4 (Base‘𝑅) = (Base‘𝑅)
2 subrg1cl.a . . . 4 1 = (1r𝑅)
31, 2issubrg 14502 . . 3 (𝐴 ∈ (SubRing‘𝑅) ↔ ((𝑅 ∈ Ring ∧ (𝑅s 𝐴) ∈ Ring) ∧ (𝐴 ⊆ (Base‘𝑅) ∧ 1𝐴)))
43simprbi 275 . 2 (𝐴 ∈ (SubRing‘𝑅) → (𝐴 ⊆ (Base‘𝑅) ∧ 1𝐴))
54simprd 114 1 (𝐴 ∈ (SubRing‘𝑅) → 1𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1402  wcel 2209  wss 3220  cfv 5372  (class class class)co 6075  Basecbs 13330  s cress 13331  1rcur 14237  Ringcrg 14274  SubRingcsubrg 14498
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-cnex 8260  ax-resscn 8261  ax-1re 8263  ax-addrcl 8266
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-fv 5380  df-ov 6078  df-inn 9284  df-ndx 13333  df-slot 13334  df-base 13336  df-subrg 14500
This theorem is referenced by:  subrg1  14512  subrgsubm  14515  issubrg2  14522  subrgintm  14524  subsubrg  14526  zsssubrg  14894
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