Theorem ofpreima2 30413

Description: Express the preimage of a function operation as a union of preimages. This version of ofpreima 30412 iterates the union over a smaller set. (Contributed by Thierry Arnoux, 8-Mar-2018.)

Hypotheses

Ref	Expression
ofpreima.1	⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
ofpreima.2	⊢ (𝜑 → 𝐺:𝐴⟶𝐶)
ofpreima.3	⊢ (𝜑 → 𝐴 ∈ 𝑉)
ofpreima.4	⊢ (𝜑 → 𝑅 Fn (𝐵 × 𝐶))

Assertion

Ref	Expression
ofpreima2	⊢ (𝜑 → (◡(𝐹 ∘f 𝑅𝐺) “ 𝐷) = ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))

Distinct variable groups:   𝐴,𝑝   𝐷,𝑝   𝐹,𝑝   𝐺,𝑝   𝑅,𝑝   𝜑,𝑝

Allowed substitution hints:   𝐵(𝑝)   𝐶(𝑝)   𝑉(𝑝)

Proof of Theorem ofpreima2

Step	Hyp	Ref	Expression
1		ofpreima.1	. . . 4 ⊢ (𝜑 → 𝐹:𝐴⟶𝐵)
2		ofpreima.2	. . . 4 ⊢ (𝜑 → 𝐺:𝐴⟶𝐶)
3		ofpreima.3	. . . 4 ⊢ (𝜑 → 𝐴 ∈ 𝑉)
4		ofpreima.4	. . . 4 ⊢ (𝜑 → 𝑅 Fn (𝐵 × 𝐶))
5	1, 2, 3, 4	ofpreima 30412	. . 3 ⊢ (𝜑 → (◡(𝐹 ∘f 𝑅𝐺) “ 𝐷) = ∪ 𝑝 ∈ (◡𝑅 “ 𝐷)((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))
6		inundif 4429	. . . . 5 ⊢ (((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺)) ∪ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) = (◡𝑅 “ 𝐷)
7		iuneq1 4937	. . . . 5 ⊢ ((((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺)) ∪ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) = (◡𝑅 “ 𝐷) → ∪ 𝑝 ∈ (((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺)) ∪ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺)))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∪ 𝑝 ∈ (◡𝑅 “ 𝐷)((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))
8	6, 7	ax-mp 5	. . . 4 ⊢ ∪ 𝑝 ∈ (((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺)) ∪ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺)))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∪ 𝑝 ∈ (◡𝑅 “ 𝐷)((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)}))
9		iunxun 5018	. . . 4 ⊢ ∪ 𝑝 ∈ (((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺)) ∪ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺)))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))
10	8, 9	eqtr3i 2848	. . 3 ⊢ ∪ 𝑝 ∈ (◡𝑅 “ 𝐷)((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))
11	5, 10	syl6eq 2874	. 2 ⊢ (𝜑 → (◡(𝐹 ∘f 𝑅𝐺) “ 𝐷) = (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)}))))
12		simpr 487	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺)))
13	12	eldifbd 3951	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → ¬ 𝑝 ∈ (ran 𝐹 × ran 𝐺))
14		cnvimass 5951	. . . . . . . . . . . . . 14 ⊢ (◡𝑅 “ 𝐷) ⊆ dom 𝑅
15		fndm 6457	. . . . . . . . . . . . . . 15 ⊢ (𝑅 Fn (𝐵 × 𝐶) → dom 𝑅 = (𝐵 × 𝐶))
16	4, 15	syl 17	. . . . . . . . . . . . . 14 ⊢ (𝜑 → dom 𝑅 = (𝐵 × 𝐶))
17	14, 16	sseqtrid 4021	. . . . . . . . . . . . 13 ⊢ (𝜑 → (◡𝑅 “ 𝐷) ⊆ (𝐵 × 𝐶))
18	17	ssdifssd 4121	. . . . . . . . . . . 12 ⊢ (𝜑 → ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺)) ⊆ (𝐵 × 𝐶))
19	18	sselda 3969	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → 𝑝 ∈ (𝐵 × 𝐶))
20		1st2nd2 7730	. . . . . . . . . . 11 ⊢ (𝑝 ∈ (𝐵 × 𝐶) → 𝑝 = ⟨(1st ‘𝑝), (2nd ‘𝑝)⟩)
21		elxp6 7725	. . . . . . . . . . . 12 ⊢ (𝑝 ∈ (ran 𝐹 × ran 𝐺) ↔ (𝑝 = ⟨(1st ‘𝑝), (2nd ‘𝑝)⟩ ∧ ((1st ‘𝑝) ∈ ran 𝐹 ∧ (2nd ‘𝑝) ∈ ran 𝐺)))
22	21	simplbi2 503	. . . . . . . . . . 11 ⊢ (𝑝 = ⟨(1st ‘𝑝), (2nd ‘𝑝)⟩ → (((1st ‘𝑝) ∈ ran 𝐹 ∧ (2nd ‘𝑝) ∈ ran 𝐺) → 𝑝 ∈ (ran 𝐹 × ran 𝐺)))
23	19, 20, 22	3syl 18	. . . . . . . . . 10 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → (((1st ‘𝑝) ∈ ran 𝐹 ∧ (2nd ‘𝑝) ∈ ran 𝐺) → 𝑝 ∈ (ran 𝐹 × ran 𝐺)))
24	13, 23	mtod 200	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → ¬ ((1st ‘𝑝) ∈ ran 𝐹 ∧ (2nd ‘𝑝) ∈ ran 𝐺))
25		ianor 978	. . . . . . . . 9 ⊢ (¬ ((1st ‘𝑝) ∈ ran 𝐹 ∧ (2nd ‘𝑝) ∈ ran 𝐺) ↔ (¬ (1st ‘𝑝) ∈ ran 𝐹 ∨ ¬ (2nd ‘𝑝) ∈ ran 𝐺))
26	24, 25	sylib 220	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → (¬ (1st ‘𝑝) ∈ ran 𝐹 ∨ ¬ (2nd ‘𝑝) ∈ ran 𝐺))
27		disjsn 4649	. . . . . . . . 9 ⊢ ((ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅ ↔ ¬ (1st ‘𝑝) ∈ ran 𝐹)
28		disjsn 4649	. . . . . . . . 9 ⊢ ((ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅ ↔ ¬ (2nd ‘𝑝) ∈ ran 𝐺)
29	27, 28	orbi12i 911	. . . . . . . 8 ⊢ (((ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅ ∨ (ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅) ↔ (¬ (1st ‘𝑝) ∈ ran 𝐹 ∨ ¬ (2nd ‘𝑝) ∈ ran 𝐺))
30	26, 29	sylibr 236	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → ((ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅ ∨ (ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅))
31	1	ffnd 6517	. . . . . . . . 9 ⊢ (𝜑 → 𝐹 Fn 𝐴)
32		dffn3 6527	. . . . . . . . 9 ⊢ (𝐹 Fn 𝐴 ↔ 𝐹:𝐴⟶ran 𝐹)
33	31, 32	sylib 220	. . . . . . . 8 ⊢ (𝜑 → 𝐹:𝐴⟶ran 𝐹)
34	2	ffnd 6517	. . . . . . . . . 10 ⊢ (𝜑 → 𝐺 Fn 𝐴)
35		dffn3 6527	. . . . . . . . . 10 ⊢ (𝐺 Fn 𝐴 ↔ 𝐺:𝐴⟶ran 𝐺)
36	34, 35	sylib 220	. . . . . . . . 9 ⊢ (𝜑 → 𝐺:𝐴⟶ran 𝐺)
37	36	adantr 483	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → 𝐺:𝐴⟶ran 𝐺)
38		fimacnvdisj 6559	. . . . . . . . . . 11 ⊢ ((𝐹:𝐴⟶ran 𝐹 ∧ (ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅) → (◡𝐹 “ {(1st ‘𝑝)}) = ∅)
39		ineq1 4183	. . . . . . . . . . . 12 ⊢ ((◡𝐹 “ {(1st ‘𝑝)}) = ∅ → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = (∅ ∩ (◡𝐺 “ {(2nd ‘𝑝)})))
40		0in 4349	. . . . . . . . . . . 12 ⊢ (∅ ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅
41	39, 40	syl6eq 2874	. . . . . . . . . . 11 ⊢ ((◡𝐹 “ {(1st ‘𝑝)}) = ∅ → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅)
42	38, 41	syl 17	. . . . . . . . . 10 ⊢ ((𝐹:𝐴⟶ran 𝐹 ∧ (ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅) → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅)
43	42	ex 415	. . . . . . . . 9 ⊢ (𝐹:𝐴⟶ran 𝐹 → ((ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅ → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅))
44		fimacnvdisj 6559	. . . . . . . . . . 11 ⊢ ((𝐺:𝐴⟶ran 𝐺 ∧ (ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅) → (◡𝐺 “ {(2nd ‘𝑝)}) = ∅)
45		ineq2 4185	. . . . . . . . . . . 12 ⊢ ((◡𝐺 “ {(2nd ‘𝑝)}) = ∅ → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ((◡𝐹 “ {(1st ‘𝑝)}) ∩ ∅))
46		in0 4347	. . . . . . . . . . . 12 ⊢ ((◡𝐹 “ {(1st ‘𝑝)}) ∩ ∅) = ∅
47	45, 46	syl6eq 2874	. . . . . . . . . . 11 ⊢ ((◡𝐺 “ {(2nd ‘𝑝)}) = ∅ → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅)
48	44, 47	syl 17	. . . . . . . . . 10 ⊢ ((𝐺:𝐴⟶ran 𝐺 ∧ (ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅) → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅)
49	48	ex 415	. . . . . . . . 9 ⊢ (𝐺:𝐴⟶ran 𝐺 → ((ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅ → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅))
50	43, 49	jaao 951	. . . . . . . 8 ⊢ ((𝐹:𝐴⟶ran 𝐹 ∧ 𝐺:𝐴⟶ran 𝐺) → (((ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅ ∨ (ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅) → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅))
51	33, 37, 50	syl2an2r 683	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → (((ran 𝐹 ∩ {(1st ‘𝑝)}) = ∅ ∨ (ran 𝐺 ∩ {(2nd ‘𝑝)}) = ∅) → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅))
52	30, 51	mpd 15	. . . . . 6 ⊢ ((𝜑 ∧ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))) → ((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅)
53	52	iuneq2dv 4945	. . . . 5 ⊢ (𝜑 → ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))∅)
54		iun0 4987	. . . . 5 ⊢ ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))∅ = ∅
55	53, 54	syl6eq 2874	. . . 4 ⊢ (𝜑 → ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) = ∅)
56	55	uneq2d 4141	. . 3 ⊢ (𝜑 → (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)}))) = (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∅))
57		un0 4346	. . 3 ⊢ (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∅) = ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)}))
58	56, 57	syl6eq 2874	. 2 ⊢ (𝜑 → (∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})) ∪ ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∖ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)}))) = ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))
59	11, 58	eqtrd 2858	1 ⊢ (𝜑 → (◡(𝐹 ∘f 𝑅𝐺) “ 𝐷) = ∪ 𝑝 ∈ ((◡𝑅 “ 𝐷) ∩ (ran 𝐹 × ran 𝐺))((◡𝐹 “ {(1st ‘𝑝)}) ∩ (◡𝐺 “ {(2nd ‘𝑝)})))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 398   ∨ wo 843   = wceq 1537   ∈ wcel 2114   ∖ cdif 3935   ∪ cun 3936   ∩ cin 3937  ∅c0 4293  {csn 4569  ⟨cop 4575  ∪ ciun 4921   × cxp 5555  ^◡ccnv 5556  dom cdm 5557  ran crn 5558   “ cima 5560   Fn wfn 6352  ⟶wf 6353  ‘cfv 6357  (class class class)co 7158   ∘_f cof 7409  1^st c1st 7689  2^nd c2nd 7690

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-rep 5192  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-reu 3147  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-ov 7161  df-oprab 7162  df-mpo 7163  df-of 7411  df-1st 7691  df-2nd 7692

This theorem is referenced by:  sibfof  31600