Theorem onnog 43391

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

Assertion

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

Proof of Theorem onnog

Step	Hyp	Ref	Expression
1		fconst6g 6810	. . 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 1138	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
4	3	ffund 6751	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → Fun (𝐴 × {𝐵}))
5		simp2 1137	. . . . 5 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐵 ∈ {1o, 2o})
6		snnzg 4799	. . . . 5 ⊢ (𝐵 ∈ {1o, 2o} → {𝐵} ≠ ∅)
7		dmxp 5953	. . . . . 6 ⊢ ({𝐵} ≠ ∅ → dom (𝐴 × {𝐵}) = 𝐴)
8	7	eqcomd 2746	. . . . 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 1136	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐴 ∈ On)
11	9, 10	eqeltrrd 2845	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → dom (𝐴 × {𝐵}) ∈ On)
12	3	frnd 6755	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → ran (𝐴 × {𝐵}) ⊆ {1o, 2o})
13		elno2 27717	. . 3 ⊢ ((𝐴 × {𝐵}) ∈ No ↔ (Fun (𝐴 × {𝐵}) ∧ dom (𝐴 × {𝐵}) ∈ On ∧ ran (𝐴 × {𝐵}) ⊆ {1o, 2o}))
14	4, 11, 12, 13	syl3anbrc 1343	. 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → (𝐴 × {𝐵}) ∈ No )
15	2, 14	mpd3an3 1462	1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o}) → (𝐴 × {𝐵}) ∈ No )

Syntax hints:   → wi 4   ∧ wa 395   ∧ w3a 1087   = wceq 1537   ∈ wcel 2108   ≠ wne 2946   ⊆ wss 3976  ∅c0 4352  {csn 4648  {cpr 4650   × cxp 5698  dom cdm 5700  ran crn 5701  Oncon0 6395  Fun wfun 6567  ⟶wf 6569  1_oc1o 8515  2_oc2o 8516   No csur 27702

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pow 5383  ax-pr 5447  ax-un 7770

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-opab 5229  df-mpt 5250  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-fun 6575  df-fn 6576  df-f 6577  df-no 27705

This theorem is referenced by:  onnobdayg  43392  bdaybndex  43393  onno  43395