Theorem noxp1o 27793

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 8463	. . . . . 6 ⊢ 1o ∈ V
2	1	prid1 4733	. . . . 5 ⊢ 1o ∈ {1o, 2o}
3	2	fconst6 6769	. . . 4 ⊢ (𝐴 × {1o}):𝐴⟶{1o, 2o}
4	1	snnz 4747	. . . . . 6 ⊢ {1o} ≠ ∅
5		dmxp 5920	. . . . . 6 ⊢ ({1o} ≠ ∅ → dom (𝐴 × {1o}) = 𝐴)
6	4, 5	ax-mp 5	. . . . 5 ⊢ dom (𝐴 × {1o}) = 𝐴
7	6	feq2i 6698	. . . 4 ⊢ ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ↔ (𝐴 × {1o}):𝐴⟶{1o, 2o})
8	3, 7	mpbir 234	. . 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 2860	. . 3 ⊢ (dom (𝐴 × {1o}) ∈ On ↔ 𝐴 ∈ On)
11	10	biimpri 231	. 2 ⊢ (𝐴 ∈ On → dom (𝐴 × {1o}) ∈ On)
12		elno3 27785	. 2 ⊢ ((𝐴 × {1o}) ∈ No ↔ ((𝐴 × {1o}):dom (𝐴 × {1o})⟶{1o, 2o} ∧ dom (𝐴 × {1o}) ∈ On))
13	9, 11, 12	sylanbrc 594	1 ⊢ (𝐴 ∈ On → (𝐴 × {1o}) ∈ No )

Syntax hints:   → wi 4   = wceq 1567   ∈ wcel 2149   ≠ wne 2964  ∅c0 4294  {csn 4594  {cpr 4596   × cxp 5660  dom cdm 5662  Oncon0 6361  ⟶wf 6533  1_oc1o 8446  2_oc2o 8447   No csur 27770

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-pow 5337  ax-pr 5405  ax-un 7733

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5557  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-suc 6367  df-fun 6539  df-fn 6540  df-f 6541  df-1o 8453  df-no 27773

This theorem is referenced by:  bdayfo  27807