Theorem onnoxpg 43969

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 6749	. . 3 ⊢ (𝐵 ∈ {1o, 2o} → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
2	1	adantl 485	. 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o}) → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
3		simp3 1150	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → (𝐴 × {𝐵}):𝐴⟶{1o, 2o})
4	3	ffund 6692	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → Fun (𝐴 × {𝐵}))
5		simp2 1149	. . . . 5 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐵 ∈ {1o, 2o})
6		snnzg 4732	. . . . 5 ⊢ (𝐵 ∈ {1o, 2o} → {𝐵} ≠ ∅)
7		dmxp 5903	. . . . . 6 ⊢ ({𝐵} ≠ ∅ → dom (𝐴 × {𝐵}) = 𝐴)
8	7	eqcomd 2767	. . . . 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 1148	. . . 4 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → 𝐴 ∈ On)
11	9, 10	eqeltrrd 2862	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → dom (𝐴 × {𝐵}) ∈ On)
12	3	frnd 6696	. . 3 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → ran (𝐴 × {𝐵}) ⊆ {1o, 2o})
13		elno2 27695	. . 3 ⊢ ((𝐴 × {𝐵}) ∈ No ↔ (Fun (𝐴 × {𝐵}) ∧ dom (𝐴 × {𝐵}) ∈ On ∧ ran (𝐴 × {𝐵}) ⊆ {1o, 2o}))
14	4, 11, 12, 13	syl3anbrc 1356	. 2 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o} ∧ (𝐴 × {𝐵}):𝐴⟶{1o, 2o}) → (𝐴 × {𝐵}) ∈ No )
15	2, 14	mpd3an3 1482	1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ {1o, 2o}) → (𝐴 × {𝐵}) ∈ No )

Syntax hints:   → wi 4   ∧ wa 399   ∧ w3a 1097   = wceq 1559   ∈ wcel 2141   ≠ wne 2956   ⊆ wss 3904  ∅c0 4285  {csn 4581  {cpr 4583   × cxp 5643  dom cdm 5645  ran crn 5646  Oncon0 6342  Fun wfun 6511  ⟶wf 6513  1_oc1o 8425  2_oc2o 8426   No csur 27681

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5245  ax-pow 5321  ax-pr 5389  ax-un 7714

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-fun 6519  df-fn 6520  df-f 6521  df-no 27684

This theorem is referenced by:  onnobdayg  43970  bdaybndex  43971  onnoxp  43973