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Theorem norn 27824
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 27819 . 2 (𝐴 No ↔ ∃𝑥 ∈ On 𝐴:𝑥⟶{1o, 2o})
2 frn 6713 . . 3 (𝐴:𝑥⟶{1o, 2o} → ran 𝐴 ⊆ {1o, 2o})
32rexlimivw 3162 . 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
This proof depends on syntax axioms:  wi 4  wcel 2143  wrex 3089  wss 3905  {cpr 4591  ran crn 5662  Oncon0 6360  wf 6532  1oc1o 8442  2oc2o 8443   No csur 27813
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5257  ax-pow 5336  ax-pr 5404  ax-un 7732
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-fun 6538  df-fn 6539  df-f 6540  df-no 27816
This theorem is used by:  elno2  27827  nofv  27830  ltsres  27835  noextend  27839  noextendseq  27840  nosepssdm  27859  nodenselem8  27864  nolt02olem  27867  nosupno  27876  noinfno  27891
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