Theorem nolt02olem 28078

Description: Lemma for nolt02o 28079. If 𝐴(𝑋) is undefined with 𝐴 surreal and 𝑋 ordinal, then dom 𝐴 ⊆ 𝑋. (Contributed by Scott Fenton, 6-Dec-2021.)

Assertion

Ref	Expression
nolt02olem	⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → dom 𝐴 ⊆ 𝑋)

Proof of Theorem nolt02olem

Step	Hyp	Ref	Expression
1		nosgnn0 28042	. . . 4 ⊢ ¬ ∅ ∈ {1o, 2o}
2	1	a1i 11	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → ¬ ∅ ∈ {1o, 2o})
3		simpl3 1212	. . . 4 ⊢ (((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) ∧ 𝑋 ∈ dom 𝐴) → (𝐴‘𝑋) = ∅)
4		simpl1 1210	. . . . . 6 ⊢ (((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) ∧ 𝑋 ∈ dom 𝐴) → 𝐴 ∈ No)
5		norn 28035	. . . . . 6 ⊢ (𝐴 ∈ No → ran 𝐴 ⊆ {1o, 2o})
6	4, 5	syl 18	. . . . 5 ⊢ (((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) ∧ 𝑋 ∈ dom 𝐴) → ran 𝐴 ⊆ {1o, 2o})
7		nofun 28033	. . . . . . 7 ⊢ (𝐴 ∈ No → Fun 𝐴)
8	7	3ad2ant1 1151	. . . . . 6 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → Fun 𝐴)
9		fvelrn 7097	. . . . . 6 ⊢ ((Fun 𝐴 ∧ 𝑋 ∈ dom 𝐴) → (𝐴‘𝑋) ∈ ran 𝐴)
10	8, 9	sylan 592	. . . . 5 ⊢ (((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) ∧ 𝑋 ∈ dom 𝐴) → (𝐴‘𝑋) ∈ ran 𝐴)
11	6, 10	sseldd 3914	. . . 4 ⊢ (((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) ∧ 𝑋 ∈ dom 𝐴) → (𝐴‘𝑋) ∈ {1o, 2o})
12	3, 11	eqeltrrd 2865	. . 3 ⊢ (((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) ∧ 𝑋 ∈ dom 𝐴) → ∅ ∈ {1o, 2o})
13	2, 12	mtand 828	. 2 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → ¬ 𝑋 ∈ dom 𝐴)
14		nodmon 28034	. . . 4 ⊢ (𝐴 ∈ No → dom 𝐴 ∈ On)
15	14	3ad2ant1 1151	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → dom 𝐴 ∈ On)
16		simp2 1155	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → 𝑋 ∈ On)
17		ontri1 6412	. . 3 ⊢ ((dom 𝐴 ∈ On ∧ 𝑋 ∈ On) → (dom 𝐴 ⊆ 𝑋 ↔ ¬ 𝑋 ∈ dom 𝐴))
18	15, 16, 17	syl2anc 596	. 2 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → (dom 𝐴 ⊆ 𝑋 ↔ ¬ 𝑋 ∈ dom 𝐴))
19	13, 18	mpbird 260	1 ⊢ ((𝐴 ∈ No ∧ 𝑋 ∈ On ∧ (𝐴‘𝑋) = ∅) → dom 𝐴 ⊆ 𝑋)

This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ↔ wb 209   ∧ wa 401   ∧ w3a 1103   = wceq 1570   ∈ wcel 2147   ⊆ wss 3900  ∅c0 4281  {cpr 4590  dom cdm 5655  ran crn 5656  Oncon0 6377  Fun wfun 6549  ‘cfv 6555  1_oc1o 8494  2_oc2o 8495  Nocsur 28024

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-12 2216  ax-ext 2735  ax-sep 5252  ax-nul 5263  ax-pow 5331  ax-pr 5395  ax-un 7772

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-ne 2960  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-tr 5216  df-id 5550  df-eprel 5555  df-po 5563  df-so 5564  df-fr 5608  df-we 5610  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-ord 6380  df-on 6381  df-suc 6383  df-iota 6509  df-fun 6557  df-fn 6558  df-f 6559  df-fv 6563  df-1o 8501  df-2o 8502  df-no 28027

This theorem is used by:  nolt02o  28079  nogt01o  28080