Theorem noxp1o 27627

Description: The Cartesian product of an ordinal and {1_o} is a surreal. (Contributed by Scott Fenton, 12-Jun-2011.)

Assertion

Ref	Expression
noxp1o	⊢ (𝐴 ∈ On → (𝐴 × {1o}) ∈ No )

Proof of Theorem noxp1o

Step	Hyp	Ref	Expression
1		1oex 8415	. . . . . 6 ⊢ 1o ∈ V
2	1	prid1 4706	. . . . 5 ⊢ 1o ∈ {1o, 2o}
3	2	fconst6 6730	. . . 4 ⊢ (𝐴 × {1o}):𝐴⟶{1o, 2o}
4	1	snnz 4720	. . . . . 6 ⊢ {1o} ≠ ∅
5		dmxp 5884	. . . . . 6 ⊢ ({1o} ≠ ∅ → dom (𝐴 × {1o}) = 𝐴)
6	4, 5	ax-mp 5	. . . . 5 ⊢ dom (𝐴 × {1o}) = 𝐴
7	6	feq2i 6660	. . . 4 ⊢ ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ↔ (𝐴 × {1o}):𝐴⟶{1o, 2o})
8	3, 7	mpbir 231	. . 3 ⊢ (𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o}
9	8	a1i 11	. 2 ⊢ (𝐴 ∈ On → (𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o})
10	6	eleq1i 2827	. . 3 ⊢ (dom (𝐴 × {1o}) ∈ On ↔ 𝐴 ∈ On)
11	10	biimpri 228	. 2 ⊢ (𝐴 ∈ On → dom (𝐴 × {1o}) ∈ On)
12		elno3 27619	. 2 ⊢ ((𝐴 × {1o}) ∈ No ↔ ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ∧ dom (𝐴 × {1o}) ∈ On))
13	9, 11, 12	sylanbrc 584	1 ⊢ (𝐴 ∈ On → (𝐴 × {1o}) ∈ No )

Syntax hints:   → wi 4   = wceq 1542   ∈ wcel 2114   ≠ wne 2932  ∅c0 4273  {csn 4567  {cpr 4569   × cxp 5629  dom cdm 5631  Oncon0 6323  ⟶wf 6494  1_oc1o 8398  2_oc2o 8399   No csur 27603

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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-pow 5307  ax-pr 5375  ax-un 7689

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-suc 6329  df-fun 6500  df-fn 6501  df-f 6502  df-1o 8405  df-no 27606

This theorem is referenced by:  bdayfo  27641