Theorem noseponlem 27716

Description: Lemma for nosepon 27717. 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 27702	. . . 4 ⊢ (𝐴 ∈ No → dom 𝐴 ∈ On)
2	1	3ad2ant1 1145	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → dom 𝐴 ∈ On)
3		nodmord 27705	. . . . . . 7 ⊢ (𝐴 ∈ No → Ord dom 𝐴)
4		ordirr 6359	. . . . . . 7 ⊢ (Ord dom 𝐴 → ¬ dom 𝐴 ∈ dom 𝐴)
5	3, 4	syl 17	. . . . . 6 ⊢ (𝐴 ∈ No → ¬ dom 𝐴 ∈ dom 𝐴)
6	5	3ad2ant1 1145	. . . . 5 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ dom 𝐴 ∈ dom 𝐴)
7		ndmfv 6894	. . . . 5 ⊢ (¬ dom 𝐴 ∈ dom 𝐴 → (𝐴‘dom 𝐴) = ∅)
8	6, 7	syl 17	. . . 4 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐴‘dom 𝐴) = ∅)
9		nosgnn0 27710	. . . . . . 7 ⊢ ¬ ∅ ∈ {1o, 2o}
10		elno3 27707	. . . . . . . . . . 11 ⊢ (𝐵 ∈ No ↔ (𝐵:dom 𝐵⟶{1o, 2o} ∧ dom 𝐵 ∈ On))
11	10	simplbi 500	. . . . . . . . . 10 ⊢ (𝐵 ∈ No → 𝐵:dom 𝐵⟶{1o, 2o})
12	11	3ad2ant2 1146	. . . . . . . . 9 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → 𝐵:dom 𝐵⟶{1o, 2o})
13		simp3 1150	. . . . . . . . 9 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → dom 𝐴 ∈ dom 𝐵)
14	12, 13	ffvelcdmd 7061	. . . . . . . 8 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐵‘dom 𝐴) ∈ {1o, 2o})
15		eleq1 2849	. . . . . . . 8 ⊢ ((𝐵‘dom 𝐴) = ∅ → ((𝐵‘dom 𝐴) ∈ {1o, 2o} ↔ ∅ ∈ {1o, 2o}))
16	14, 15	syl5ibcom 247	. . . . . . 7 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ((𝐵‘dom 𝐴) = ∅ → ∅ ∈ {1o, 2o}))
17	9, 16	mtoi 201	. . . . . 6 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ (𝐵‘dom 𝐴) = ∅)
18	17	neqned 2963	. . . . 5 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐵‘dom 𝐴) ≠ ∅)
19	18	necomd 3011	. . . 4 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ∅ ≠ (𝐵‘dom 𝐴))
20	8, 19	eqnetrd 3023	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴))
21		fveq2 6862	. . . . 5 ⊢ (𝑥 = dom 𝐴 → (𝐴‘𝑥) = (𝐴‘dom 𝐴))
22		fveq2 6862	. . . . 5 ⊢ (𝑥 = dom 𝐴 → (𝐵‘𝑥) = (𝐵‘dom 𝐴))
23	21, 22	neeq12d 3017	. . . 4 ⊢ (𝑥 = dom 𝐴 → ((𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴)))
24	23	rspcev 3580	. . 3 ⊢ ((dom 𝐴 ∈ On ∧ (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴)) → ∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥))
25	2, 20, 24	syl2anc 593	. 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥))
26		df-ne 2957	. . . 4 ⊢ ((𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ ¬ (𝐴‘𝑥) = (𝐵‘𝑥))
27	26	rexbii 3108	. . 3 ⊢ (∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ ∃𝑥 ∈ On ¬ (𝐴‘𝑥) = (𝐵‘𝑥))
28		rexnal 3113	. . 3 ⊢ (∃𝑥 ∈ On ¬ (𝐴‘𝑥) = (𝐵‘𝑥) ↔ ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))
29	27, 28	bitri 277	. 2 ⊢ (∃𝑥 ∈ On (𝐴‘𝑥) ≠ (𝐵‘𝑥) ↔ ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))
30	25, 29	sylib 220	1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ ∀𝑥 ∈ On (𝐴‘𝑥) = (𝐵‘𝑥))

Syntax hints:  ¬ wn 3   → wi 4   ∧ w3a 1097   = wceq 1559   ∈ wcel 2141   ≠ wne 2956  ∀wral 3075  ∃wrex 3085  ∅c0 4283  {cpr 4581  dom cdm 5643  Ord word 6340  Oncon0 6341  ⟶wf 6512  ‘cfv 6516  1_oc1o 8424  2_oc2o 8425   No csur 27692

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-12 2211  ax-ext 2733  ax-sep 5243  ax-nul 5253  ax-pow 5319  ax-pr 5387  ax-un 7713

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-ne 2957  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-br 5098  df-opab 5160  df-tr 5205  df-id 5538  df-eprel 5543  df-po 5551  df-so 5552  df-fr 5596  df-we 5598  df-xp 5649  df-rel 5650  df-cnv 5651  df-co 5652  df-dm 5653  df-rn 5654  df-ord 6344  df-on 6345  df-suc 6347  df-iota 6472  df-fun 6518  df-fn 6519  df-f 6520  df-fv 6524  df-1o 8431  df-2o 8432  df-no 27695

This theorem is referenced by:  nosepon  27717