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Theorem crngunit 15460
Description: Property of being a unit in a commutative ring. (Contributed by Mario Carneiro, 18-Apr-2016.)
Hypotheses
Ref Expression
crngunit.1  |-  U  =  (Unit `  R )
crngunit.2  |-  .1.  =  ( 1r `  R )
crngunit.3  |-  .||  =  (
||r `  R )
Assertion
Ref Expression
crngunit  |-  ( R  e.  CRing  ->  ( X  e.  U  <->  X  .||  .1.  )
)

Proof of Theorem crngunit
Dummy variable  y is distinct from all other variables.
StepHypRef Expression
1 eqid 2296 . . . . . . . . . . 11  |-  ( Base `  R )  =  (
Base `  R )
2 eqid 2296 . . . . . . . . . . 11  |-  ( .r
`  R )  =  ( .r `  R
)
3 eqid 2296 . . . . . . . . . . 11  |-  (oppr `  R
)  =  (oppr `  R
)
4 eqid 2296 . . . . . . . . . . 11  |-  ( .r
`  (oppr
`  R ) )  =  ( .r `  (oppr `  R ) )
51, 2, 3, 4crngoppr 15425 . . . . . . . . . 10  |-  ( ( R  e.  CRing  /\  y  e.  ( Base `  R
)  /\  X  e.  ( Base `  R )
)  ->  ( y
( .r `  R
) X )  =  ( y ( .r
`  (oppr
`  R ) ) X ) )
653expa 1151 . . . . . . . . 9  |-  ( ( ( R  e.  CRing  /\  y  e.  ( Base `  R ) )  /\  X  e.  ( Base `  R ) )  -> 
( y ( .r
`  R ) X )  =  ( y ( .r `  (oppr `  R
) ) X ) )
76eqcomd 2301 . . . . . . . 8  |-  ( ( ( R  e.  CRing  /\  y  e.  ( Base `  R ) )  /\  X  e.  ( Base `  R ) )  -> 
( y ( .r
`  (oppr
`  R ) ) X )  =  ( y ( .r `  R ) X ) )
87an32s 779 . . . . . . 7  |-  ( ( ( R  e.  CRing  /\  X  e.  ( Base `  R ) )  /\  y  e.  ( Base `  R ) )  -> 
( y ( .r
`  (oppr
`  R ) ) X )  =  ( y ( .r `  R ) X ) )
98eqeq1d 2304 . . . . . 6  |-  ( ( ( R  e.  CRing  /\  X  e.  ( Base `  R ) )  /\  y  e.  ( Base `  R ) )  -> 
( ( y ( .r `  (oppr `  R
) ) X )  =  .1.  <->  ( y
( .r `  R
) X )  =  .1.  ) )
109rexbidva 2573 . . . . 5  |-  ( ( R  e.  CRing  /\  X  e.  ( Base `  R
) )  ->  ( E. y  e.  ( Base `  R ) ( y ( .r `  (oppr `  R ) ) X )  =  .1.  <->  E. y  e.  ( Base `  R
) ( y ( .r `  R ) X )  =  .1.  ) )
1110pm5.32da 622 . . . 4  |-  ( R  e.  CRing  ->  ( ( X  e.  ( Base `  R )  /\  E. y  e.  ( Base `  R ) ( y ( .r `  (oppr `  R
) ) X )  =  .1.  )  <->  ( X  e.  ( Base `  R
)  /\  E. y  e.  ( Base `  R
) ( y ( .r `  R ) X )  =  .1.  ) ) )
123, 1opprbas 15427 . . . . 5  |-  ( Base `  R )  =  (
Base `  (oppr
`  R ) )
13 eqid 2296 . . . . 5  |-  ( ||r `  (oppr `  R
) )  =  (
||r `  (oppr
`  R ) )
1412, 13, 4dvdsr 15444 . . . 4  |-  ( X ( ||r `
 (oppr
`  R ) )  .1.  <->  ( X  e.  ( Base `  R
)  /\  E. y  e.  ( Base `  R
) ( y ( .r `  (oppr `  R
) ) X )  =  .1.  ) )
15 crngunit.3 . . . . 5  |-  .||  =  (
||r `  R )
161, 15, 2dvdsr 15444 . . . 4  |-  ( X 
.||  .1.  <->  ( X  e.  ( Base `  R
)  /\  E. y  e.  ( Base `  R
) ( y ( .r `  R ) X )  =  .1.  ) )
1711, 14, 163bitr4g 279 . . 3  |-  ( R  e.  CRing  ->  ( X
( ||r `
 (oppr
`  R ) )  .1.  <->  X  .||  .1.  )
)
1817anbi2d 684 . 2  |-  ( R  e.  CRing  ->  ( ( X  .||  .1.  /\  X
( ||r `
 (oppr
`  R ) )  .1.  )  <->  ( X  .|| 
.1.  /\  X  .||  .1.  )
) )
19 crngunit.1 . . 3  |-  U  =  (Unit `  R )
20 crngunit.2 . . 3  |-  .1.  =  ( 1r `  R )
2119, 20, 15, 3, 13isunit 15455 . 2  |-  ( X  e.  U  <->  ( X  .|| 
.1.  /\  X ( ||r `  (oppr
`  R ) )  .1.  ) )
22 pm4.24 624 . 2  |-  ( X 
.||  .1.  <->  ( X  .||  .1.  /\  X  .||  .1.  )
)
2318, 21, 223bitr4g 279 1  |-  ( R  e.  CRing  ->  ( X  e.  U  <->  X  .||  .1.  )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    = wceq 1632    e. wcel 1696   E.wrex 2557   class class class wbr 4039   ` cfv 5271  (class class class)co 5874   Basecbs 13164   .rcmulr 13225   CRingccrg 15354   1rcur 15355  opprcoppr 15420   ||rcdsr 15436  Unitcui 15437
This theorem is referenced by:  dvdsunit  15461  znunit  16533
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-rep 4147  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528  ax-cnex 8809  ax-resscn 8810  ax-1cn 8811  ax-icn 8812  ax-addcl 8813  ax-addrcl 8814  ax-mulcl 8815  ax-mulrcl 8816  ax-mulcom 8817  ax-addass 8818  ax-mulass 8819  ax-distr 8820  ax-i2m1 8821  ax-1ne0 8822  ax-1rid 8823  ax-rnegex 8824  ax-rrecex 8825  ax-cnre 8826  ax-pre-lttri 8827  ax-pre-lttrn 8828  ax-pre-ltadd 8829  ax-pre-mulgt0 8830
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-nel 2462  df-ral 2561  df-rex 2562  df-reu 2563  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-pss 3181  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-tp 3661  df-op 3662  df-uni 3844  df-iun 3923  df-br 4040  df-opab 4094  df-mpt 4095  df-tr 4130  df-eprel 4321  df-id 4325  df-po 4330  df-so 4331  df-fr 4368  df-we 4370  df-ord 4411  df-on 4412  df-lim 4413  df-suc 4414  df-om 4673  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-tpos 6250  df-riota 6320  df-recs 6404  df-rdg 6439  df-er 6676  df-en 6880  df-dom 6881  df-sdom 6882  df-pnf 8885  df-mnf 8886  df-xr 8887  df-ltxr 8888  df-le 8889  df-sub 9055  df-neg 9056  df-nn 9763  df-2 9820  df-3 9821  df-ndx 13167  df-slot 13168  df-base 13169  df-sets 13170  df-plusg 13237  df-mulr 13238  df-cmn 15107  df-mgp 15342  df-cring 15357  df-oppr 15421  df-dvdsr 15439  df-unit 15440
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