Theorem tfsconcatb0 43317

Description: The concatentation with the empty series leaves the series unchanged. (Contributed by RP, 25-Feb-2025.)

Hypothesis

Ref	Expression
tfsconcat.op	⊢ + = (𝑎 ∈ V, 𝑏 ∈ V ↦ (𝑎 ∪ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((dom 𝑎 +o dom 𝑏) ∖ dom 𝑎) ∧ ∃𝑧 ∈ dom 𝑏(𝑥 = (dom 𝑎 +o 𝑧) ∧ 𝑦 = (𝑏‘𝑧)))}))

Assertion

Ref	Expression
tfsconcatb0	⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐵 = ∅ ↔ (𝐴 + 𝐵) = 𝐴))

Distinct variable groups:   𝐴,𝑎,𝑏,𝑥,𝑦,𝑧   𝐵,𝑎,𝑏,𝑥,𝑦,𝑧   𝐶,𝑎,𝑏,𝑥,𝑦,𝑧   𝐷,𝑎,𝑏,𝑥,𝑦,𝑧

Allowed substitution hints:   + (𝑥,𝑦,𝑧,𝑎,𝑏)

Proof of Theorem tfsconcatb0

Step	Hyp	Ref	Expression
1		fnrel 6588	. . . . . . 7 ⊢ (𝐵 Fn 𝐷 → Rel 𝐵)
2		reldm0 5874	. . . . . . 7 ⊢ (Rel 𝐵 → (𝐵 = ∅ ↔ dom 𝐵 = ∅))
3	1, 2	syl 17	. . . . . 6 ⊢ (𝐵 Fn 𝐷 → (𝐵 = ∅ ↔ dom 𝐵 = ∅))
4		fndm 6589	. . . . . . 7 ⊢ (𝐵 Fn 𝐷 → dom 𝐵 = 𝐷)
5	4	eqeq1d 2731	. . . . . 6 ⊢ (𝐵 Fn 𝐷 → (dom 𝐵 = ∅ ↔ 𝐷 = ∅))
6	3, 5	bitrd 279	. . . . 5 ⊢ (𝐵 Fn 𝐷 → (𝐵 = ∅ ↔ 𝐷 = ∅))
7	6	ad2antlr 727	. . . 4 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐵 = ∅ ↔ 𝐷 = ∅))
8		rex0 4313	. . . . . . . . . . 11 ⊢ ¬ ∃𝑧 ∈ ∅ (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))
9		rexeq 3286	. . . . . . . . . . . 12 ⊢ (𝐷 = ∅ → (∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)) ↔ ∃𝑧 ∈ ∅ (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))))
10	9	adantl 481	. . . . . . . . . . 11 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 𝐷 = ∅) → (∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)) ↔ ∃𝑧 ∈ ∅ (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))))
11	8, 10	mtbiri 327	. . . . . . . . . 10 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 𝐷 = ∅) → ¬ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))
12	11	intnand 488	. . . . . . . . 9 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 𝐷 = ∅) → ¬ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))))
13	12	alrimivv 1928	. . . . . . . 8 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 𝐷 = ∅) → ∀𝑥∀𝑦 ¬ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))))
14		opab0 5501	. . . . . . . 8 ⊢ ({⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} = ∅ ↔ ∀𝑥∀𝑦 ¬ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))))
15	13, 14	sylibr 234	. . . . . . 7 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 𝐷 = ∅) → {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} = ∅)
16		0ss 4353	. . . . . . 7 ⊢ ∅ ⊆ 𝐴
17	15, 16	eqsstrdi 3982	. . . . . 6 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 𝐷 = ∅) → {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴)
18	17	ex 412	. . . . 5 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐷 = ∅ → {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴))
19		df-1o 8395	. . . . . . . . . 10 ⊢ 1o = suc ∅
20		simpl 482	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ On ∧ ¬ 𝐷 = ∅) → 𝐷 ∈ On)
21		on0eln0 6368	. . . . . . . . . . . . 13 ⊢ (𝐷 ∈ On → (∅ ∈ 𝐷 ↔ 𝐷 ≠ ∅))
22		df-ne 2926	. . . . . . . . . . . . 13 ⊢ (𝐷 ≠ ∅ ↔ ¬ 𝐷 = ∅)
23	21, 22	bitrdi 287	. . . . . . . . . . . 12 ⊢ (𝐷 ∈ On → (∅ ∈ 𝐷 ↔ ¬ 𝐷 = ∅))
24	23	biimpar 477	. . . . . . . . . . 11 ⊢ ((𝐷 ∈ On ∧ ¬ 𝐷 = ∅) → ∅ ∈ 𝐷)
25		onsucss 43239	. . . . . . . . . . 11 ⊢ (𝐷 ∈ On → (∅ ∈ 𝐷 → suc ∅ ⊆ 𝐷))
26	20, 24, 25	sylc 65	. . . . . . . . . 10 ⊢ ((𝐷 ∈ On ∧ ¬ 𝐷 = ∅) → suc ∅ ⊆ 𝐷)
27	19, 26	eqsstrid 3976	. . . . . . . . 9 ⊢ ((𝐷 ∈ On ∧ ¬ 𝐷 = ∅) → 1o ⊆ 𝐷)
28	27	ex 412	. . . . . . . 8 ⊢ (𝐷 ∈ On → (¬ 𝐷 = ∅ → 1o ⊆ 𝐷))
29	28	adantl 481	. . . . . . 7 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → (¬ 𝐷 = ∅ → 1o ⊆ 𝐷))
30	29	adantl 481	. . . . . 6 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (¬ 𝐷 = ∅ → 1o ⊆ 𝐷))
31		simpr 484	. . . . . . . . . . . . 13 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → 1o ⊆ 𝐷)
32		0lt1o 8429	. . . . . . . . . . . . . 14 ⊢ ∅ ∈ 1o
33	32	a1i 11	. . . . . . . . . . . . 13 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → ∅ ∈ 1o)
34	31, 33	sseldd 3938	. . . . . . . . . . . 12 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → ∅ ∈ 𝐷)
35		oaord1 8476	. . . . . . . . . . . . 13 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → (∅ ∈ 𝐷 ↔ 𝐶 ∈ (𝐶 +o 𝐷)))
36	35	ad2antlr 727	. . . . . . . . . . . 12 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (∅ ∈ 𝐷 ↔ 𝐶 ∈ (𝐶 +o 𝐷)))
37	34, 36	mpbid 232	. . . . . . . . . . 11 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → 𝐶 ∈ (𝐶 +o 𝐷))
38		ssidd 3961	. . . . . . . . . . 11 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → 𝐶 ⊆ 𝐶)
39		oacl 8460	. . . . . . . . . . . . . . 15 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → (𝐶 +o 𝐷) ∈ On)
40		eloni 6321	. . . . . . . . . . . . . . 15 ⊢ ((𝐶 +o 𝐷) ∈ On → Ord (𝐶 +o 𝐷))
41	39, 40	syl 17	. . . . . . . . . . . . . 14 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → Ord (𝐶 +o 𝐷))
42		eloni 6321	. . . . . . . . . . . . . . 15 ⊢ (𝐶 ∈ On → Ord 𝐶)
43	42	adantr 480	. . . . . . . . . . . . . 14 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → Ord 𝐶)
44	41, 43	jca 511	. . . . . . . . . . . . 13 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → (Ord (𝐶 +o 𝐷) ∧ Ord 𝐶))
45	44	ad2antlr 727	. . . . . . . . . . . 12 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (Ord (𝐶 +o 𝐷) ∧ Ord 𝐶))
46		ordeldif 43231	. . . . . . . . . . . 12 ⊢ ((Ord (𝐶 +o 𝐷) ∧ Ord 𝐶) → (𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ↔ (𝐶 ∈ (𝐶 +o 𝐷) ∧ 𝐶 ⊆ 𝐶)))
47	45, 46	syl 17	. . . . . . . . . . 11 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ↔ (𝐶 ∈ (𝐶 +o 𝐷) ∧ 𝐶 ⊆ 𝐶)))
48	37, 38, 47	mpbir2and 713	. . . . . . . . . 10 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → 𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶))
49		simpl 482	. . . . . . . . . . . . . . 15 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → 𝐶 ∈ On)
50	49	ad2antlr 727	. . . . . . . . . . . . . 14 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → 𝐶 ∈ On)
51		oa0 8441	. . . . . . . . . . . . . 14 ⊢ (𝐶 ∈ On → (𝐶 +o ∅) = 𝐶)
52	50, 51	syl 17	. . . . . . . . . . . . 13 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (𝐶 +o ∅) = 𝐶)
53	52	eqcomd 2735	. . . . . . . . . . . 12 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → 𝐶 = (𝐶 +o ∅))
54		eqidd 2730	. . . . . . . . . . . 12 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (𝐵‘∅) = (𝐵‘∅))
55	53, 54	jca 511	. . . . . . . . . . 11 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (𝐶 = (𝐶 +o ∅) ∧ (𝐵‘∅) = (𝐵‘∅)))
56		oveq2 7361	. . . . . . . . . . . . . 14 ⊢ (𝑧 = ∅ → (𝐶 +o 𝑧) = (𝐶 +o ∅))
57	56	eqeq2d 2740	. . . . . . . . . . . . 13 ⊢ (𝑧 = ∅ → (𝐶 = (𝐶 +o 𝑧) ↔ 𝐶 = (𝐶 +o ∅)))
58		fveq2 6826	. . . . . . . . . . . . . 14 ⊢ (𝑧 = ∅ → (𝐵‘𝑧) = (𝐵‘∅))
59	58	eqeq2d 2740	. . . . . . . . . . . . 13 ⊢ (𝑧 = ∅ → ((𝐵‘∅) = (𝐵‘𝑧) ↔ (𝐵‘∅) = (𝐵‘∅)))
60	57, 59	anbi12d 632	. . . . . . . . . . . 12 ⊢ (𝑧 = ∅ → ((𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧)) ↔ (𝐶 = (𝐶 +o ∅) ∧ (𝐵‘∅) = (𝐵‘∅))))
61	60	rspcev 3579	. . . . . . . . . . 11 ⊢ ((∅ ∈ 𝐷 ∧ (𝐶 = (𝐶 +o ∅) ∧ (𝐵‘∅) = (𝐵‘∅))) → ∃𝑧 ∈ 𝐷 (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧)))
62	34, 55, 61	syl2anc 584	. . . . . . . . . 10 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → ∃𝑧 ∈ 𝐷 (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧)))
63		fvexd 6841	. . . . . . . . . . 11 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (𝐵‘∅) ∈ V)
64		eleq1 2816	. . . . . . . . . . . . . 14 ⊢ (𝑥 = 𝐶 → (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ↔ 𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶)))
65	64	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝑥 = 𝐶 ∧ 𝑦 = (𝐵‘∅)) → (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ↔ 𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶)))
66		eqeq1 2733	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = 𝐶 → (𝑥 = (𝐶 +o 𝑧) ↔ 𝐶 = (𝐶 +o 𝑧)))
67		eqeq1 2733	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = (𝐵‘∅) → (𝑦 = (𝐵‘𝑧) ↔ (𝐵‘∅) = (𝐵‘𝑧)))
68	66, 67	bi2anan9 638	. . . . . . . . . . . . . 14 ⊢ ((𝑥 = 𝐶 ∧ 𝑦 = (𝐵‘∅)) → ((𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)) ↔ (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧))))
69	68	rexbidv 3153	. . . . . . . . . . . . 13 ⊢ ((𝑥 = 𝐶 ∧ 𝑦 = (𝐵‘∅)) → (∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)) ↔ ∃𝑧 ∈ 𝐷 (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧))))
70	65, 69	anbi12d 632	. . . . . . . . . . . 12 ⊢ ((𝑥 = 𝐶 ∧ 𝑦 = (𝐵‘∅)) → ((𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧))) ↔ (𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧)))))
71	70	opelopabga 5480	. . . . . . . . . . 11 ⊢ ((𝐶 ∈ On ∧ (𝐵‘∅) ∈ V) → (⟨𝐶, (𝐵‘∅)⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ↔ (𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧)))))
72	50, 63, 71	syl2anc 584	. . . . . . . . . 10 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → (⟨𝐶, (𝐵‘∅)⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ↔ (𝐶 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝐶 = (𝐶 +o 𝑧) ∧ (𝐵‘∅) = (𝐵‘𝑧)))))
73	48, 62, 72	mpbir2and 713	. . . . . . . . 9 ⊢ ((((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) ∧ 1o ⊆ 𝐷) → ⟨𝐶, (𝐵‘∅)⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))})
74	73	ex 412	. . . . . . . 8 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (1o ⊆ 𝐷 → ⟨𝐶, (𝐵‘∅)⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))}))
75		ordirr 6329	. . . . . . . . . . . . 13 ⊢ (Ord 𝐶 → ¬ 𝐶 ∈ 𝐶)
76	42, 75	syl 17	. . . . . . . . . . . 12 ⊢ (𝐶 ∈ On → ¬ 𝐶 ∈ 𝐶)
77	76	adantr 480	. . . . . . . . . . 11 ⊢ ((𝐶 ∈ On ∧ 𝐷 ∈ On) → ¬ 𝐶 ∈ 𝐶)
78	77	adantl 481	. . . . . . . . . 10 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → ¬ 𝐶 ∈ 𝐶)
79		fndm 6589	. . . . . . . . . . . 12 ⊢ (𝐴 Fn 𝐶 → dom 𝐴 = 𝐶)
80	79	adantr 480	. . . . . . . . . . 11 ⊢ ((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) → dom 𝐴 = 𝐶)
81	80	adantr 480	. . . . . . . . . 10 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → dom 𝐴 = 𝐶)
82	78, 81	neleqtrrd 2851	. . . . . . . . 9 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → ¬ 𝐶 ∈ dom 𝐴)
83	49	adantl 481	. . . . . . . . . 10 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → 𝐶 ∈ On)
84		fvexd 6841	. . . . . . . . . 10 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐵‘∅) ∈ V)
85	83, 84	opeldmd 5853	. . . . . . . . 9 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (⟨𝐶, (𝐵‘∅)⟩ ∈ 𝐴 → 𝐶 ∈ dom 𝐴))
86	82, 85	mtod 198	. . . . . . . 8 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → ¬ ⟨𝐶, (𝐵‘∅)⟩ ∈ 𝐴)
87	74, 86	jctird 526	. . . . . . 7 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (1o ⊆ 𝐷 → (⟨𝐶, (𝐵‘∅)⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ∧ ¬ ⟨𝐶, (𝐵‘∅)⟩ ∈ 𝐴)))
88		nelss 4003	. . . . . . 7 ⊢ ((⟨𝐶, (𝐵‘∅)⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ∧ ¬ ⟨𝐶, (𝐵‘∅)⟩ ∈ 𝐴) → ¬ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴)
89	87, 88	syl6 35	. . . . . 6 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (1o ⊆ 𝐷 → ¬ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴))
90	30, 89	syld 47	. . . . 5 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (¬ 𝐷 = ∅ → ¬ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴))
91	18, 90	impcon4bid 227	. . . 4 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐷 = ∅ ↔ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴))
92	7, 91	bitrd 279	. . 3 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐵 = ∅ ↔ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴))
93		ssequn2 4142	. . 3 ⊢ ({⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))} ⊆ 𝐴 ↔ (𝐴 ∪ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))}) = 𝐴)
94	92, 93	bitrdi 287	. 2 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐵 = ∅ ↔ (𝐴 ∪ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))}) = 𝐴))
95		tfsconcat.op	. . . 4 ⊢ + = (𝑎 ∈ V, 𝑏 ∈ V ↦ (𝑎 ∪ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((dom 𝑎 +o dom 𝑏) ∖ dom 𝑎) ∧ ∃𝑧 ∈ dom 𝑏(𝑥 = (dom 𝑎 +o 𝑧) ∧ 𝑦 = (𝑏‘𝑧)))}))
96	95	tfsconcatun 43310	. . 3 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐴 + 𝐵) = (𝐴 ∪ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))}))
97	96	eqeq1d 2731	. 2 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → ((𝐴 + 𝐵) = 𝐴 ↔ (𝐴 ∪ {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ ((𝐶 +o 𝐷) ∖ 𝐶) ∧ ∃𝑧 ∈ 𝐷 (𝑥 = (𝐶 +o 𝑧) ∧ 𝑦 = (𝐵‘𝑧)))}) = 𝐴))
98	94, 97	bitr4d 282	1 ⊢ (((𝐴 Fn 𝐶 ∧ 𝐵 Fn 𝐷) ∧ (𝐶 ∈ On ∧ 𝐷 ∈ On)) → (𝐵 = ∅ ↔ (𝐴 + 𝐵) = 𝐴))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395  ∀wal 1538   = wceq 1540   ∈ wcel 2109   ≠ wne 2925  ∃wrex 3053  Vcvv 3438   ∖ cdif 3902   ∪ cun 3903   ⊆ wss 3905  ∅c0 4286  ⟨cop 4585  {copab 5157  dom cdm 5623  Rel wrel 5628  Ord word 6310  Oncon0 6311  suc csuc 6313   Fn wfn 6481  ‘cfv 6486  (class class class)co 7353   ∈ cmpo 7355  1_oc1o 8388   +_o coa 8392

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5221  ax-sep 5238  ax-nul 5248  ax-pow 5307  ax-pr 5374  ax-un 7675

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-rmo 3345  df-reu 3346  df-rab 3397  df-v 3440  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-pss 3925  df-nul 4287  df-if 4479  df-pw 4555  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4862  df-int 4900  df-iun 4946  df-br 5096  df-opab 5158  df-mpt 5177  df-tr 5203  df-id 5518  df-eprel 5523  df-po 5531  df-so 5532  df-fr 5576  df-we 5578  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-pred 6253  df-ord 6314  df-on 6315  df-lim 6316  df-suc 6317  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-ov 7356  df-oprab 7357  df-mpo 7358  df-om 7807  df-2nd 7932  df-frecs 8221  df-wrecs 8252  df-recs 8301  df-rdg 8339  df-1o 8395  df-oadd 8399

This theorem is referenced by: (None)