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Theorem rngosn4 36434
Description: Obsolete as of 25-Jan-2020. Use rngen1zr 20257 instead. The only unital ring with one element is the zero ring. (Contributed by FL, 14-Feb-2010.) (Revised by Mario Carneiro, 30-Apr-2015.) (New usage is discouraged.)
Hypotheses
Ref Expression
on1el3.1 𝐺 = (1st𝑅)
on1el3.2 𝑋 = ran 𝐺
Assertion
Ref Expression
rngosn4 ((𝑅 ∈ RingOps ∧ 𝐴𝑋) → (𝑋 ≈ 1o𝑅 = ⟨{⟨⟨𝐴, 𝐴⟩, 𝐴⟩}, {⟨⟨𝐴, 𝐴⟩, 𝐴⟩}⟩))

Proof of Theorem rngosn4
StepHypRef Expression
1 en1eqsnbi 9226 . . 3 (𝐴𝑋 → (𝑋 ≈ 1o𝑋 = {𝐴}))
21adantl 483 . 2 ((𝑅 ∈ RingOps ∧ 𝐴𝑋) → (𝑋 ≈ 1o𝑋 = {𝐴}))
3 on1el3.1 . . 3 𝐺 = (1st𝑅)
4 on1el3.2 . . 3 𝑋 = ran 𝐺
53, 4rngosn3 36433 . 2 ((𝑅 ∈ RingOps ∧ 𝐴𝑋) → (𝑋 = {𝐴} ↔ 𝑅 = ⟨{⟨⟨𝐴, 𝐴⟩, 𝐴⟩}, {⟨⟨𝐴, 𝐴⟩, 𝐴⟩}⟩))
62, 5bitrd 279 1 ((𝑅 ∈ RingOps ∧ 𝐴𝑋) → (𝑋 ≈ 1o𝑅 = ⟨{⟨⟨𝐴, 𝐴⟩, 𝐴⟩}, {⟨⟨𝐴, 𝐴⟩, 𝐴⟩}⟩))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 397   = wceq 1542  wcel 2107  {csn 4590  cop 4596   class class class wbr 5109  ran crn 5638  cfv 6500  1st c1st 7923  1oc1o 8409  cen 8886  RingOpscrngo 36403
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-sep 5260  ax-nul 5267  ax-pr 5388  ax-un 7676
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3353  df-rab 3407  df-v 3449  df-sbc 3744  df-csb 3860  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-nul 4287  df-if 4491  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4870  df-iun 4960  df-br 5110  df-opab 5172  df-mpt 5193  df-id 5535  df-xp 5643  df-rel 5644  df-cnv 5645  df-co 5646  df-dm 5647  df-rn 5648  df-res 5649  df-ima 5650  df-suc 6327  df-iota 6452  df-fun 6502  df-fn 6503  df-f 6504  df-f1 6505  df-fo 6506  df-f1o 6507  df-fv 6508  df-ov 7364  df-1st 7925  df-2nd 7926  df-1o 8416  df-en 8890  df-grpo 29484  df-ablo 29536  df-rngo 36404
This theorem is referenced by:  rngosn6  36435
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