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Theorem noxp1o 26917
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 8377 . . . . . 6 1o ∈ V
21prid1 4710 . . . . 5 1o ∈ {1o, 2o}
32fconst6 6715 . . . 4 (𝐴 × {1o}):𝐴⟶{1o, 2o}
41snnz 4724 . . . . . 6 {1o} ≠ ∅
5 dmxp 5870 . . . . . 6 ({1o} ≠ ∅ → dom (𝐴 × {1o}) = 𝐴)
64, 5ax-mp 5 . . . . 5 dom (𝐴 × {1o}) = 𝐴
76feq2i 6643 . . . 4 ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ↔ (𝐴 × {1o}):𝐴⟶{1o, 2o})
83, 7mpbir 230 . . 3 (𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o}
98a1i 11 . 2 (𝐴 ∈ On → (𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o})
106eleq1i 2827 . . 3 (dom (𝐴 × {1o}) ∈ On ↔ 𝐴 ∈ On)
1110biimpri 227 . 2 (𝐴 ∈ On → dom (𝐴 × {1o}) ∈ On)
12 elno3 26909 . 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 2105  wne 2940  c0 4269  {csn 4573  {cpr 4575   × cxp 5618  dom cdm 5620  Oncon0 6302  wf 6475  1oc1o 8360  2oc2o 8361   No csur 26894
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707  ax-rep 5229  ax-sep 5243  ax-nul 5250  ax-pr 5372
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3350  df-rab 3404  df-v 3443  df-sbc 3728  df-csb 3844  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4270  df-if 4474  df-sn 4574  df-pr 4576  df-op 4580  df-uni 4853  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5176  df-id 5518  df-xp 5626  df-rel 5627  df-cnv 5628  df-co 5629  df-dm 5630  df-rn 5631  df-res 5632  df-ima 5633  df-suc 6308  df-iota 6431  df-fun 6481  df-fn 6482  df-f 6483  df-f1 6484  df-fo 6485  df-f1o 6486  df-fv 6487  df-1o 8367  df-no 26897
This theorem is referenced by:  bdayfo  26931
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