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Theorem noxp1o 27551
Description: The Cartesian product of an ordinal and {1o} is a surreal. (Contributed by Scott Fenton, 12-Jun-2011.)
Assertion
Ref Expression
noxp1o (𝐴 ∈ On → (𝐴 × {1o}) ∈ No )

Proof of Theorem noxp1o
StepHypRef Expression
1 1oex 8421 . . . . . 6 1o ∈ V
21prid1 4722 . . . . 5 1o ∈ {1o, 2o}
32fconst6 6732 . . . 4 (𝐴 × {1o}):𝐴⟶{1o, 2o}
41snnz 4736 . . . . . 6 {1o} ≠ ∅
5 dmxp 5882 . . . . . 6 ({1o} ≠ ∅ → dom (𝐴 × {1o}) = 𝐴)
64, 5ax-mp 5 . . . . 5 dom (𝐴 × {1o}) = 𝐴
76feq2i 6662 . . . 4 ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ↔ (𝐴 × {1o}):𝐴⟶{1o, 2o})
83, 7mpbir 231 . . 3 (𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o}
98a1i 11 . 2 (𝐴 ∈ On → (𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o})
106eleq1i 2819 . . 3 (dom (𝐴 × {1o}) ∈ On ↔ 𝐴 ∈ On)
1110biimpri 228 . 2 (𝐴 ∈ On → dom (𝐴 × {1o}) ∈ On)
12 elno3 27543 . 2 ((𝐴 × {1o}) ∈ No ↔ ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ∧ dom (𝐴 × {1o}) ∈ On))
139, 11, 12sylanbrc 583 1 (𝐴 ∈ On → (𝐴 × {1o}) ∈ No )
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wcel 2109  wne 2925  c0 4292  {csn 4585  {cpr 4587   × cxp 5629  dom cdm 5631  Oncon0 6320  wf 6495  1oc1o 8404  2oc2o 8405   No csur 27527
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5246  ax-nul 5256  ax-pow 5315  ax-pr 5382  ax-un 7691
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3403  df-v 3446  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4293  df-if 4485  df-pw 4561  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-br 5103  df-opab 5165  df-mpt 5184  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-suc 6326  df-fun 6501  df-fn 6502  df-f 6503  df-1o 8411  df-no 27530
This theorem is referenced by:  bdayfo  27565
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