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Theorem subrgring 14101
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 2207 . . . . 5  |-  ( Base `  R )  =  (
Base `  R )
3 eqid 2207 . . . . 5  |-  ( 1r
`  R )  =  ( 1r `  R
)
42, 3issubrg 14098 . . . 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 2294 1  |-  ( A  e.  (SubRing `  R
)  ->  S  e.  Ring )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1373    e. wcel 2178    C_ wss 3174   ` cfv 5290  (class class class)co 5967   Basecbs 12947   ↾s cress 12948   1rcur 13836   Ringcrg 13873  SubRingcsubrg 14094
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-cnex 8051  ax-resscn 8052  ax-1re 8054  ax-addrcl 8057
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-int 3900  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-fv 5298  df-ov 5970  df-inn 9072  df-ndx 12950  df-slot 12951  df-base 12953  df-subrg 14096
This theorem is referenced by:  subrgcrng  14102  subrgsubg  14104  subrg1  14108  subrgmcl  14110  subrgsubm  14111  subrgdvds  14112  subrguss  14113  subrginv  14114  subrgdv  14115  subrgunit  14116  subrgugrp  14117  subrgnzr  14119  subsubrg  14122  resrhm  14125  resrhm2b  14126  sralmod  14327
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