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Theorem nofv 33238
 Description: The function value of a surreal is either a sign or the empty set. (Contributed by Scott Fenton, 22-Jun-2011.)
Assertion
Ref Expression
nofv (𝐴 No → ((𝐴𝑋) = ∅ ∨ (𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o))

Proof of Theorem nofv
StepHypRef Expression
1 pm2.1 894 . . 3 𝑋 ∈ dom 𝐴𝑋 ∈ dom 𝐴)
2 ndmfv 6682 . . . . 5 𝑋 ∈ dom 𝐴 → (𝐴𝑋) = ∅)
32a1i 11 . . . 4 (𝐴 No → (¬ 𝑋 ∈ dom 𝐴 → (𝐴𝑋) = ∅))
4 nofun 33230 . . . . 5 (𝐴 No → Fun 𝐴)
5 norn 33232 . . . . 5 (𝐴 No → ran 𝐴 ⊆ {1o, 2o})
6 fvelrn 6826 . . . . . . . 8 ((Fun 𝐴𝑋 ∈ dom 𝐴) → (𝐴𝑋) ∈ ran 𝐴)
7 ssel 3935 . . . . . . . 8 (ran 𝐴 ⊆ {1o, 2o} → ((𝐴𝑋) ∈ ran 𝐴 → (𝐴𝑋) ∈ {1o, 2o}))
86, 7syl5com 31 . . . . . . 7 ((Fun 𝐴𝑋 ∈ dom 𝐴) → (ran 𝐴 ⊆ {1o, 2o} → (𝐴𝑋) ∈ {1o, 2o}))
98impancom 455 . . . . . 6 ((Fun 𝐴 ∧ ran 𝐴 ⊆ {1o, 2o}) → (𝑋 ∈ dom 𝐴 → (𝐴𝑋) ∈ {1o, 2o}))
10 1oex 8097 . . . . . . 7 1o ∈ V
11 2on 8098 . . . . . . . 8 2o ∈ On
1211elexi 3488 . . . . . . 7 2o ∈ V
1310, 12elpr2 4564 . . . . . 6 ((𝐴𝑋) ∈ {1o, 2o} ↔ ((𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o))
149, 13syl6ib 254 . . . . 5 ((Fun 𝐴 ∧ ran 𝐴 ⊆ {1o, 2o}) → (𝑋 ∈ dom 𝐴 → ((𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o)))
154, 5, 14syl2anc 587 . . . 4 (𝐴 No → (𝑋 ∈ dom 𝐴 → ((𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o)))
163, 15orim12d 962 . . 3 (𝐴 No → ((¬ 𝑋 ∈ dom 𝐴𝑋 ∈ dom 𝐴) → ((𝐴𝑋) = ∅ ∨ ((𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o))))
171, 16mpi 20 . 2 (𝐴 No → ((𝐴𝑋) = ∅ ∨ ((𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o)))
18 3orass 1087 . 2 (((𝐴𝑋) = ∅ ∨ (𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o) ↔ ((𝐴𝑋) = ∅ ∨ ((𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o)))
1917, 18sylibr 237 1 (𝐴 No → ((𝐴𝑋) = ∅ ∨ (𝐴𝑋) = 1o ∨ (𝐴𝑋) = 2o))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 399   ∨ wo 844   ∨ w3o 1083   = wceq 1538   ∈ wcel 2114   ⊆ wss 3908  ∅c0 4265  {cpr 4541  dom cdm 5532  ran crn 5533  Oncon0 6169  Fun wfun 6328  ‘cfv 6334  1oc1o 8082  2oc2o 8083   No csur 33221 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2178  ax-ext 2794  ax-rep 5166  ax-sep 5179  ax-nul 5186  ax-pow 5243  ax-pr 5307  ax-un 7446 This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2801  df-cleq 2815  df-clel 2894  df-nfc 2962  df-ne 3012  df-ral 3135  df-rex 3136  df-reu 3137  df-rab 3139  df-v 3471  df-sbc 3748  df-csb 3856  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3927  df-nul 4266  df-if 4440  df-pw 4513  df-sn 4540  df-pr 4542  df-tp 4544  df-op 4546  df-uni 4814  df-iun 4896  df-br 5043  df-opab 5105  df-mpt 5123  df-tr 5149  df-id 5437  df-eprel 5442  df-po 5451  df-so 5452  df-fr 5491  df-we 5493  df-xp 5538  df-rel 5539  df-cnv 5540  df-co 5541  df-dm 5542  df-rn 5543  df-res 5544  df-ima 5545  df-ord 6172  df-on 6173  df-suc 6175  df-iota 6293  df-fun 6336  df-fn 6337  df-f 6338  df-f1 6339  df-fo 6340  df-f1o 6341  df-fv 6342  df-1o 8089  df-2o 8090  df-no 33224 This theorem is referenced by:  nolesgn2o  33252  nosep1o  33260  nolt02o  33273  nosupbnd1lem5  33286  nosupbnd1lem6  33287
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