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Theorem subrgring 14532
Description: A subring is a ring. (Contributed by Stefan O'Rear, 27-Nov-2014.)
Hypothesis
Ref Expression
subrgring.1  |-  S  =  ( Rs  A )
Assertion
Ref Expression
subrgring  |-  ( A  e.  (SubRing `  R
)  ->  S  e.  Ring )

Proof of Theorem subrgring
StepHypRef Expression
1 subrgring.1 . 2  |-  S  =  ( Rs  A )
2 eqid 2238 . . . . 5  |-  ( Base `  R )  =  (
Base `  R )
3 eqid 2238 . . . . 5  |-  ( 1r
`  R )  =  ( 1r `  R
)
42, 3issubrg 14529 . . . 4  |-  ( A  e.  (SubRing `  R
)  <->  ( ( R  e.  Ring  /\  ( Rs  A )  e.  Ring )  /\  ( A  C_  ( Base `  R )  /\  ( 1r `  R
)  e.  A ) ) )
54simplbi 274 . . 3  |-  ( A  e.  (SubRing `  R
)  ->  ( R  e.  Ring  /\  ( Rs  A
)  e.  Ring )
)
65simprd 114 . 2  |-  ( A  e.  (SubRing `  R
)  ->  ( Rs  A
)  e.  Ring )
71, 6eqeltrid 2325 1  |-  ( A  e.  (SubRing `  R
)  ->  S  e.  Ring )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ wa 104    = wceq 1402    e. wcel 2209    C_ wss 3220   ` cfv 5377  (class class class)co 6085   Basecbs 13352   ↾s cress 13353   1rcur 14262   Ringcrg 14300  SubRingcsubrg 14525
This proof depends on 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 4249  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-cnex 8270  ax-resscn 8271  ax-1re 8273  ax-addrcl 8276
This proof 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 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-fv 5385  df-ov 6088  df-inn 9305  df-ndx 13355  df-slot 13356  df-base 13358  df-subrg 14527
This theorem is used by:  subrgcrng  14533  subrgsubg  14535  subrg1  14539  subrgmcl  14541  subrgsubm  14542  subrgdvds  14543  subrguss  14544  subrginv  14545  subrgdv  14546  subrgunit  14547  subrgugrp  14548  subrgnzr  14550  subsubrg  14553  resrhm  14556  resrhm2b  14557  sralmod  14787  issubassa3  15012
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