Theorem noseponlem 27809

Description: Lemma for nosepon 27810. Consider a case of proper subset domain. (Contributed by Scott Fenton, 21-Sep-2020.)

Assertion

Ref	Expression
noseponlem	⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))

Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Proof of Theorem noseponlem

Step	Hyp	Ref	Expression
1		nodmon 27795	. . . 4 ⊢ (𝐴 ∈ No → dom 𝐴 ∈ On)
2	1	3ad2ant1 1151	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → dom 𝐴 ∈ On)
3		nodmord 27798	. . . . . . 7 ⊢ (𝐴 ∈ No → Ord dom 𝐴)
4		ordirr 6380	. . . . . . 7 ⊢ (Ord dom 𝐴 → ¬ dom 𝐴 ∈ dom 𝐴)
5	3, 4	syl 18	. . . . . 6 ⊢ (𝐴 ∈ No → ¬ dom 𝐴 ∈ dom 𝐴)
6	5	3ad2ant1 1151	. . . . 5 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ dom 𝐴 ∈ dom 𝐴)
7		ndmfv 6915	. . . . 5 ⊢ (¬ dom 𝐴 ∈ dom 𝐴 → (𝐴‘dom 𝐴) = ∅)
8	6, 7	syl 18	. . . 4 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐴‘dom 𝐴) = ∅)
9		nosgnn0 27803	. . . . . . 7 ⊢ ¬ ∅ ∈ {1o, 2o}
10		elno3 27800	. . . . . . . . . . 11 ⊢ (𝐵 ∈ No ↔ (𝐵:dom 𝐵⟶{1o, 2o} ∧ dom 𝐵 ∈ On))
11	10	simplbi 501	. . . . . . . . . 10 ⊢ (𝐵 ∈ No → 𝐵:dom 𝐵⟶{1o, 2o})
12	11	3ad2ant2 1152	. . . . . . . . 9 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → 𝐵:dom 𝐵⟶{1o, 2o})
13		simp3 1156	. . . . . . . . 9 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → dom 𝐴 ∈ dom 𝐵)
14	12, 13	ffvelcdmd 7082	. . . . . . . 8 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐵‘dom 𝐴) ∈ {1o, 2o})
15		eleq1 2851	. . . . . . . 8 ⊢ ((𝐵‘dom 𝐴) = ∅ → ((𝐵‘dom 𝐴) ∈ {1o, 2o} ↔ ∅ ∈ {1o, 2o}))
16	14, 15	syl5ibcom 248	. . . . . . 7 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ((𝐵‘dom 𝐴) = ∅ → ∅ ∈ {1o, 2o}))
17	9, 16	mtoi 202	. . . . . 6 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ (𝐵‘dom 𝐴) = ∅)
18	17	neqned 2965	. . . . 5 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐵‘dom 𝐴) ≠ ∅)
19	18	necomd 3013	. . . 4 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ∅ ≠ (𝐵‘dom 𝐴))
20	8, 19	eqnetrd 3025	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴))
21		fveq2 6883	. . . . 5 ⊢ (𝑥 = dom 𝐴 → (𝐴‘𝑥) = (𝐴‘dom 𝐴))
22		fveq2 6883	. . . . 5 ⊢ (𝑥 = dom 𝐴 → (𝐵‘𝑥) = (𝐵‘dom 𝐴))
23	21, 22	neeq12d 3019	. . . 4 ⊢ (𝑥 = dom 𝐴 → ((𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴)))
24	23	rspcev 3582	. . 3 ⊢ ((dom 𝐴 ∈ On ∧ (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴)) → ∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥))
25	2, 20, 24	syl2anc 595	. 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥))
26		df-ne 2959	. . . 4 ⊢ ((𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ ¬ (𝐴‘𝑥) = (𝐵‘𝑥))
27	26	rexbii 3112	. . 3 ⊢ (∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ ∃𝑥 ∈ On ¬ (𝐴‘𝑥) = (𝐵‘𝑥))
28		rexnal 3117	. . 3 ⊢ (∃𝑥 ∈ On ¬ (𝐴‘𝑥) = (𝐵‘𝑥) ↔ ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))
29	27, 28	bitri 278	. 2 ⊢ (∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))
30	25, 29	sylib 221	1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))

Syntax hints:  ¬ wn 3   → wi 4   ∧ w3a 1103   = wceq 1570   ∈ wcel 2143   ≠ wne 2958  ∀wral 3079  ∃wrex 3089  ∅c0 4287  {cpr 4592  dom cdm 5663  Ord word 6361  Oncon0 6362  ⟶wf 6534  ‘cfv 6538  1_oc1o 8447  2_oc2o 8448   No csur 27785

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pow 5338  ax-pr 5406  ax-un 7734

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-pw 4565  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-tr 5220  df-id 5558  df-eprel 5563  df-po 5571  df-so 5572  df-fr 5616  df-we 5618  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-ord 6365  df-on 6366  df-suc 6368  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-1o 8454  df-2o 8455  df-no 27788

This theorem is referenced by:  nosepon  27810