Theorem issref 5428

Description: Two ways to state a relation is reflexive. Adapted from Tarski. (Contributed by FL, 15-Jan-2012.) (Revised by NM, 30-Mar-2016.)

Assertion

Ref	Expression
issref	⊢ (( I ↾ 𝐴) ⊆ 𝑅 ↔ ∀𝑥 ∈ 𝐴 𝑥𝑅𝑥)

Distinct variable groups:   𝑥,𝐴   𝑥,𝑅

Proof of Theorem issref

Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-ral 2901	. 2 ⊢ (∀𝑥 ∈ 𝐴 𝑥𝑅𝑥 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥𝑅𝑥))
2		vex 3176	. . . . 5 ⊢ 𝑥 ∈ V
3		opelresi 5328	. . . . 5 ⊢ (𝑥 ∈ V → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) ↔ 𝑥 ∈ 𝐴))
4	2, 3	ax-mp 5	. . . 4 ⊢ (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) ↔ 𝑥 ∈ 𝐴)
5		df-br 4584	. . . . 5 ⊢ (𝑥𝑅𝑥 ↔ ⟨𝑥, 𝑥⟩ ∈ 𝑅)
6	5	bicomi 213	. . . 4 ⊢ (⟨𝑥, 𝑥⟩ ∈ 𝑅 ↔ 𝑥𝑅𝑥)
7	4, 6	imbi12i 339	. . 3 ⊢ ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ (𝑥 ∈ 𝐴 → 𝑥𝑅𝑥))
8	7	albii 1737	. 2 ⊢ (∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝑥𝑅𝑥))
9		ralidm 4027	. . . . . 6 ⊢ (∀𝑥 ∈ V ∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ ∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅))
10		ralv 3192	. . . . . 6 ⊢ (∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ ∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅))
11	9, 10	bitri 263	. . . . 5 ⊢ (∀𝑥 ∈ V ∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ ∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅))
12		df-ral 2901	. . . . . . . . 9 ⊢ (∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ ∀𝑥(𝑥 ∈ V → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅)))
13		pm2.27 41	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ V → ((𝑥 ∈ V → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅)) → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅)))
14		opelresg 5324	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ V → (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) ↔ (⟨𝑥, 𝑧⟩ ∈ I ∧ 𝑥 ∈ 𝐴)))
15		df-br 4584	. . . . . . . . . . . . . . . . 17 ⊢ (𝑥 I 𝑧 ↔ ⟨𝑥, 𝑧⟩ ∈ I )
16		vex 3176	. . . . . . . . . . . . . . . . . . 19 ⊢ 𝑧 ∈ V
17	16	ideq 5196	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 I 𝑧 ↔ 𝑥 = 𝑧)
18		opelresi 5328	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑥 ∈ 𝐴 → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) ↔ 𝑥 ∈ 𝐴))
19		pm2.27 41	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ⟨𝑥, 𝑥⟩ ∈ 𝑅))
20		opeq2 4341	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑥 = 𝑧 → ⟨𝑥, 𝑥⟩ = ⟨𝑥, 𝑧⟩)
21	20	eleq1d 2672	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑥 = 𝑧 → (⟨𝑥, 𝑥⟩ ∈ 𝑅 ↔ ⟨𝑥, 𝑧⟩ ∈ 𝑅))
22	21	biimpcd 238	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (⟨𝑥, 𝑥⟩ ∈ 𝑅 → (𝑥 = 𝑧 → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
23	19, 22	syl6 34	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → (𝑥 = 𝑧 → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
24	18, 23	syl6bir 243	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑥 ∈ 𝐴 → (𝑥 ∈ 𝐴 → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → (𝑥 = 𝑧 → ⟨𝑥, 𝑧⟩ ∈ 𝑅))))
25	24	pm2.43i 50	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑥 ∈ 𝐴 → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → (𝑥 = 𝑧 → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
26	25	com3r 85	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑥 = 𝑧 → (𝑥 ∈ 𝐴 → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
27	17, 26	sylbi 206	. . . . . . . . . . . . . . . . 17 ⊢ (𝑥 I 𝑧 → (𝑥 ∈ 𝐴 → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
28	15, 27	sylbir 224	. . . . . . . . . . . . . . . 16 ⊢ (⟨𝑥, 𝑧⟩ ∈ I → (𝑥 ∈ 𝐴 → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
29	28	imp 444	. . . . . . . . . . . . . . 15 ⊢ ((⟨𝑥, 𝑧⟩ ∈ I ∧ 𝑥 ∈ 𝐴) → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
30	14, 29	syl6bi 242	. . . . . . . . . . . . . 14 ⊢ (𝑧 ∈ V → (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
31	30	com3r 85	. . . . . . . . . . . . 13 ⊢ ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → (𝑧 ∈ V → (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
32	31	ralrimiv 2948	. . . . . . . . . . . 12 ⊢ ((⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
33	13, 32	syl6 34	. . . . . . . . . . 11 ⊢ (𝑥 ∈ V → ((𝑥 ∈ V → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅)) → ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
34	2, 33	ax-mp 5	. . . . . . . . . 10 ⊢ ((𝑥 ∈ V → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅)) → ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
35	34	sps 2043	. . . . . . . . 9 ⊢ (∀𝑥(𝑥 ∈ V → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅)) → ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
36	12, 35	sylbi 206	. . . . . . . 8 ⊢ (∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
37	36	ralimi 2936	. . . . . . 7 ⊢ (∀𝑥 ∈ V ∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ∀𝑥 ∈ V ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
38		eleq1 2676	. . . . . . . . 9 ⊢ (𝑦 = ⟨𝑥, 𝑧⟩ → (𝑦 ∈ ( I ↾ 𝐴) ↔ ⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴)))
39		eleq1 2676	. . . . . . . . 9 ⊢ (𝑦 = ⟨𝑥, 𝑧⟩ → (𝑦 ∈ 𝑅 ↔ ⟨𝑥, 𝑧⟩ ∈ 𝑅))
40	38, 39	imbi12d 333	. . . . . . . 8 ⊢ (𝑦 = ⟨𝑥, 𝑧⟩ → ((𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅) ↔ (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅)))
41	40	ralxp 5185	. . . . . . 7 ⊢ (∀𝑦 ∈ (V × V)(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅) ↔ ∀𝑥 ∈ V ∀𝑧 ∈ V (⟨𝑥, 𝑧⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑧⟩ ∈ 𝑅))
42	37, 41	sylibr 223	. . . . . 6 ⊢ (∀𝑥 ∈ V ∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ∀𝑦 ∈ (V × V)(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
43		df-ral 2901	. . . . . . 7 ⊢ (∀𝑦 ∈ (V × V)(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅) ↔ ∀𝑦(𝑦 ∈ (V × V) → (𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅)))
44		relres 5346	. . . . . . . . . . . 12 ⊢ Rel ( I ↾ 𝐴)
45		df-rel 5045	. . . . . . . . . . . 12 ⊢ (Rel ( I ↾ 𝐴) ↔ ( I ↾ 𝐴) ⊆ (V × V))
46	44, 45	mpbi 219	. . . . . . . . . . 11 ⊢ ( I ↾ 𝐴) ⊆ (V × V)
47	46	sseli 3564	. . . . . . . . . 10 ⊢ (𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ (V × V))
48	47	ancri 573	. . . . . . . . 9 ⊢ (𝑦 ∈ ( I ↾ 𝐴) → (𝑦 ∈ (V × V) ∧ 𝑦 ∈ ( I ↾ 𝐴)))
49		pm3.31 460	. . . . . . . . 9 ⊢ ((𝑦 ∈ (V × V) → (𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅)) → ((𝑦 ∈ (V × V) ∧ 𝑦 ∈ ( I ↾ 𝐴)) → 𝑦 ∈ 𝑅))
50	48, 49	syl5 33	. . . . . . . 8 ⊢ ((𝑦 ∈ (V × V) → (𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅)) → (𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
51	50	alimi 1730	. . . . . . 7 ⊢ (∀𝑦(𝑦 ∈ (V × V) → (𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅)) → ∀𝑦(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
52	43, 51	sylbi 206	. . . . . 6 ⊢ (∀𝑦 ∈ (V × V)(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅) → ∀𝑦(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
53	42, 52	syl 17	. . . . 5 ⊢ (∀𝑥 ∈ V ∀𝑥 ∈ V (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ∀𝑦(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
54	11, 53	sylbir 224	. . . 4 ⊢ (∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ∀𝑦(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
55		dfss2 3557	. . . 4 ⊢ (( I ↾ 𝐴) ⊆ 𝑅 ↔ ∀𝑦(𝑦 ∈ ( I ↾ 𝐴) → 𝑦 ∈ 𝑅))
56	54, 55	sylibr 223	. . 3 ⊢ (∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) → ( I ↾ 𝐴) ⊆ 𝑅)
57		ssel 3562	. . . 4 ⊢ (( I ↾ 𝐴) ⊆ 𝑅 → (⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅))
58	57	alrimiv 1842	. . 3 ⊢ (( I ↾ 𝐴) ⊆ 𝑅 → ∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅))
59	56, 58	impbii 198	. 2 ⊢ (∀𝑥(⟨𝑥, 𝑥⟩ ∈ ( I ↾ 𝐴) → ⟨𝑥, 𝑥⟩ ∈ 𝑅) ↔ ( I ↾ 𝐴) ⊆ 𝑅)
60	1, 8, 59	3bitr2ri 288	1 ⊢ (( I ↾ 𝐴) ⊆ 𝑅 ↔ ∀𝑥 ∈ 𝐴 𝑥𝑅𝑥)

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383  ∀wal 1473   = wceq 1475   ∈ wcel 1977  ∀wral 2896  Vcvv 3173   ⊆ wss 3540  ⟨cop 4131   class class class wbr 4583   I cid 4948   × cxp 5036   ↾ cres 5040  Rel wrel 5043

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-iun 4457  df-br 4584  df-opab 4644  df-id 4953  df-xp 5044  df-rel 5045  df-res 5050

This theorem is referenced by: (None)