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Theorem norn 27783
Description: The range of a surreal is a subset of the surreal signs. (Contributed by Scott Fenton, 16-Jun-2011.)
Assertion
Ref Expression
norn (𝐴 No → ran 𝐴 ⊆ {1o, 2o})

Proof of Theorem norn
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 elno 27778 . 2 (𝐴 No ↔ ∃𝑥 ∈ On 𝐴:𝑥⟶{1o, 2o})
2 frn 6716 . . 3 (𝐴:𝑥⟶{1o, 2o} → ran 𝐴 ⊆ {1o, 2o})
32rexlimivw 3168 . 2 (∃𝑥 ∈ On 𝐴:𝑥⟶{1o, 2o} → ran 𝐴 ⊆ {1o, 2o})
41, 3sylbi 220 1 (𝐴 No → ran 𝐴 ⊆ {1o, 2o})
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2149  wrex 3095  wss 3913  {cpr 4596  ran crn 5665  Oncon0 6363  wf 6535  1oc1o 8448  2oc2o 8449   No csur 27772
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-pow 5339  ax-pr 5407  ax-un 7735
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-xp 5670  df-rel 5671  df-cnv 5672  df-co 5673  df-dm 5674  df-rn 5675  df-fun 6541  df-fn 6542  df-f 6543  df-no 27775
This theorem is referenced by:  elno2  27786  nofv  27789  ltsres  27794  noextend  27798  noextendseq  27799  nosepssdm  27818  nodenselem8  27823  nolt02olem  27826  nosupno  27835  noinfno  27850
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