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Theorem rngo1cl 33367
Description: The unit of a ring belongs to the base set. (Contributed by FL, 12-Feb-2010.) (New usage is discouraged.)
Hypotheses
Ref Expression
ring1cl.1 𝑋 = ran (1st𝑅)
ring1cl.2 𝐻 = (2nd𝑅)
ring1cl.3 𝑈 = (GId‘𝐻)
Assertion
Ref Expression
rngo1cl (𝑅 ∈ RingOps → 𝑈𝑋)

Proof of Theorem rngo1cl
StepHypRef Expression
1 ring1cl.2 . . . . . 6 𝐻 = (2nd𝑅)
21rngomndo 33363 . . . . 5 (𝑅 ∈ RingOps → 𝐻 ∈ MndOp)
31eleq1i 2689 . . . . . 6 (𝐻 ∈ MndOp ↔ (2nd𝑅) ∈ MndOp)
4 mndoismgmOLD 33298 . . . . . . 7 ((2nd𝑅) ∈ MndOp → (2nd𝑅) ∈ Magma)
5 mndoisexid 33297 . . . . . . 7 ((2nd𝑅) ∈ MndOp → (2nd𝑅) ∈ ExId )
64, 5jca 554 . . . . . 6 ((2nd𝑅) ∈ MndOp → ((2nd𝑅) ∈ Magma ∧ (2nd𝑅) ∈ ExId ))
73, 6sylbi 207 . . . . 5 (𝐻 ∈ MndOp → ((2nd𝑅) ∈ Magma ∧ (2nd𝑅) ∈ ExId ))
82, 7syl 17 . . . 4 (𝑅 ∈ RingOps → ((2nd𝑅) ∈ Magma ∧ (2nd𝑅) ∈ ExId ))
9 elin 3774 . . . 4 ((2nd𝑅) ∈ (Magma ∩ ExId ) ↔ ((2nd𝑅) ∈ Magma ∧ (2nd𝑅) ∈ ExId ))
108, 9sylibr 224 . . 3 (𝑅 ∈ RingOps → (2nd𝑅) ∈ (Magma ∩ ExId ))
11 eqid 2621 . . . 4 ran (2nd𝑅) = ran (2nd𝑅)
12 ring1cl.3 . . . . 5 𝑈 = (GId‘𝐻)
131fveq2i 6151 . . . . 5 (GId‘𝐻) = (GId‘(2nd𝑅))
1412, 13eqtri 2643 . . . 4 𝑈 = (GId‘(2nd𝑅))
1511, 14iorlid 33286 . . 3 ((2nd𝑅) ∈ (Magma ∩ ExId ) → 𝑈 ∈ ran (2nd𝑅))
1610, 15syl 17 . 2 (𝑅 ∈ RingOps → 𝑈 ∈ ran (2nd𝑅))
17 ring1cl.1 . . 3 𝑋 = ran (1st𝑅)
18 eqid 2621 . . . 4 (2nd𝑅) = (2nd𝑅)
19 eqid 2621 . . . 4 (1st𝑅) = (1st𝑅)
2018, 19rngorn1eq 33362 . . 3 (𝑅 ∈ RingOps → ran (1st𝑅) = ran (2nd𝑅))
21 eqtr 2640 . . . 4 ((𝑋 = ran (1st𝑅) ∧ ran (1st𝑅) = ran (2nd𝑅)) → 𝑋 = ran (2nd𝑅))
2221eleq2d 2684 . . 3 ((𝑋 = ran (1st𝑅) ∧ ran (1st𝑅) = ran (2nd𝑅)) → (𝑈𝑋𝑈 ∈ ran (2nd𝑅)))
2317, 20, 22sylancr 694 . 2 (𝑅 ∈ RingOps → (𝑈𝑋𝑈 ∈ ran (2nd𝑅)))
2416, 23mpbird 247 1 (𝑅 ∈ RingOps → 𝑈𝑋)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 384   = wceq 1480  wcel 1987  cin 3554  ran crn 5075  cfv 5847  1st c1st 7111  2nd c2nd 7112  GIdcgi 27190   ExId cexid 33272  Magmacmagm 33276  MndOpcmndo 33294  RingOpscrngo 33322
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1483  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-nul 3892  df-if 4059  df-sn 4149  df-pr 4151  df-op 4155  df-uni 4403  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-id 4989  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-fo 5853  df-fv 5855  df-riota 6565  df-ov 6607  df-1st 7113  df-2nd 7114  df-grpo 27193  df-gid 27194  df-ablo 27245  df-ass 33271  df-exid 33273  df-mgmOLD 33277  df-sgrOLD 33289  df-mndo 33295  df-rngo 33323
This theorem is referenced by:  rngoueqz  33368  rngonegmn1l  33369  rngonegmn1r  33370  rngoneglmul  33371  rngonegrmul  33372  isdrngo2  33386  rngohomco  33402  rngoisocnv  33409  idlnegcl  33450  1idl  33454  0rngo  33455  smprngopr  33480  prnc  33495  isfldidl  33496  isdmn3  33502
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