Theorem onnoxpg 43856

Description: Every ordinal maps to a surreal number. (Contributed by RP, 21-Sep-2023.)

Assertion

Ref	Expression
onnoxpg	⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o}) → (𝐴 × {𝐵}) ∈ No )

Proof of Theorem onnoxpg

Step	Hyp	Ref	Expression
1		fconst6g 6729	. . 3 ⊢ (𝐵 ∈ {1o, 2o} → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
2	1	adantl 481	. 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o}) → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
3		simp3 1139	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
4	3	ffund 6672	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → Fun (𝐴 × {𝐵}))
5		simp2 1138	. . . . 5 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐵 ∈ {1o, 2o})
6		snnzg 4718	. . . . 5 ⊢ (𝐵 ∈ {1o, 2o} → {𝐵} ≠ ∅)
7		dmxp 5884	. . . . . 6 ⊢ ({𝐵} ≠ ∅ → dom (𝐴 × {𝐵}) = 𝐴)
8	7	eqcomd 2742	. . . . 5 ⊢ ({𝐵} ≠ ∅ → 𝐴 = dom (𝐴 × {𝐵}))
9	5, 6, 8	3syl 18	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐴 = dom (𝐴 × {𝐵}))
10		simp1 1137	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐴 ∈ On)
11	9, 10	eqeltrrd 2837	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → dom (𝐴 × {𝐵}) ∈ On)
12	3	frnd 6676	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → ran (𝐴 × {𝐵}) ⊆ {1o, 2o})
13		elno2 27618	. . 3 ⊢ ((𝐴 × {𝐵}) ∈ No ↔ (Fun (𝐴 × {𝐵}) ∧ dom (𝐴 × {𝐵}) ∈ On ∧ ran (𝐴 × {𝐵}) ⊆ {1o, 2o}))
14	4, 11, 12, 13	syl3anbrc 1345	. 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → (𝐴 × {𝐵}) ∈ No )
15	2, 14	mpd3an3 1465	1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o}) → (𝐴 × {𝐵}) ∈ No )

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1087   = wceq 1542   ∈ wcel 2114   ≠ wne 2932   ⊆ wss 3889  ∅c0 4273  {csn 4567  {cpr 4569   × cxp 5629  dom cdm 5631  ran crn 5632  Oncon0 6323  Fun wfun 6492  ⟶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-fun 6500  df-fn 6501  df-f 6502  df-no 27606

This theorem is referenced by:  onnobdayg  43857  bdaybndex  43858  onnoxp  43860