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Theorem smprngopr 33822
Description: A simple ring (one whose only ideals are 0 and 𝑅) is a prime ring. (Contributed by Jeff Madsen, 6-Jan-2011.)
Hypotheses
Ref Expression
smprngpr.1 𝐺 = (1st𝑅)
smprngpr.2 𝐻 = (2nd𝑅)
smprngpr.3 𝑋 = ran 𝐺
smprngpr.4 𝑍 = (GId‘𝐺)
smprngpr.5 𝑈 = (GId‘𝐻)
Assertion
Ref Expression
smprngopr ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → 𝑅 ∈ PrRing)

Proof of Theorem smprngopr
Dummy variables 𝑖 𝑗 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simp1 1059 . 2 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → 𝑅 ∈ RingOps)
2 smprngpr.1 . . . . 5 𝐺 = (1st𝑅)
3 smprngpr.4 . . . . 5 𝑍 = (GId‘𝐺)
42, 30idl 33795 . . . 4 (𝑅 ∈ RingOps → {𝑍} ∈ (Idl‘𝑅))
543ad2ant1 1080 . . 3 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → {𝑍} ∈ (Idl‘𝑅))
6 smprngpr.2 . . . . . . . 8 𝐻 = (2nd𝑅)
7 smprngpr.3 . . . . . . . 8 𝑋 = ran 𝐺
8 smprngpr.5 . . . . . . . 8 𝑈 = (GId‘𝐻)
92, 6, 7, 3, 80rngo 33797 . . . . . . 7 (𝑅 ∈ RingOps → (𝑍 = 𝑈𝑋 = {𝑍}))
10 eqcom 2627 . . . . . . 7 (𝑈 = 𝑍𝑍 = 𝑈)
11 eqcom 2627 . . . . . . 7 ({𝑍} = 𝑋𝑋 = {𝑍})
129, 10, 113bitr4g 303 . . . . . 6 (𝑅 ∈ RingOps → (𝑈 = 𝑍 ↔ {𝑍} = 𝑋))
1312necon3bid 2835 . . . . 5 (𝑅 ∈ RingOps → (𝑈𝑍 ↔ {𝑍} ≠ 𝑋))
1413biimpa 501 . . . 4 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → {𝑍} ≠ 𝑋)
15143adant3 1079 . . 3 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → {𝑍} ≠ 𝑋)
16 df-pr 4171 . . . . . . . 8 {{𝑍}, 𝑋} = ({{𝑍}} ∪ {𝑋})
1716eqeq2i 2632 . . . . . . 7 ((Idl‘𝑅) = {{𝑍}, 𝑋} ↔ (Idl‘𝑅) = ({{𝑍}} ∪ {𝑋}))
18 eleq2 2688 . . . . . . . . 9 ((Idl‘𝑅) = ({{𝑍}} ∪ {𝑋}) → (𝑖 ∈ (Idl‘𝑅) ↔ 𝑖 ∈ ({{𝑍}} ∪ {𝑋})))
19 eleq2 2688 . . . . . . . . 9 ((Idl‘𝑅) = ({{𝑍}} ∪ {𝑋}) → (𝑗 ∈ (Idl‘𝑅) ↔ 𝑗 ∈ ({{𝑍}} ∪ {𝑋})))
2018, 19anbi12d 746 . . . . . . . 8 ((Idl‘𝑅) = ({{𝑍}} ∪ {𝑋}) → ((𝑖 ∈ (Idl‘𝑅) ∧ 𝑗 ∈ (Idl‘𝑅)) ↔ (𝑖 ∈ ({{𝑍}} ∪ {𝑋}) ∧ 𝑗 ∈ ({{𝑍}} ∪ {𝑋}))))
21 elun 3745 . . . . . . . . . 10 (𝑖 ∈ ({{𝑍}} ∪ {𝑋}) ↔ (𝑖 ∈ {{𝑍}} ∨ 𝑖 ∈ {𝑋}))
22 velsn 4184 . . . . . . . . . . 11 (𝑖 ∈ {{𝑍}} ↔ 𝑖 = {𝑍})
23 velsn 4184 . . . . . . . . . . 11 (𝑖 ∈ {𝑋} ↔ 𝑖 = 𝑋)
2422, 23orbi12i 543 . . . . . . . . . 10 ((𝑖 ∈ {{𝑍}} ∨ 𝑖 ∈ {𝑋}) ↔ (𝑖 = {𝑍} ∨ 𝑖 = 𝑋))
2521, 24bitri 264 . . . . . . . . 9 (𝑖 ∈ ({{𝑍}} ∪ {𝑋}) ↔ (𝑖 = {𝑍} ∨ 𝑖 = 𝑋))
26 elun 3745 . . . . . . . . . 10 (𝑗 ∈ ({{𝑍}} ∪ {𝑋}) ↔ (𝑗 ∈ {{𝑍}} ∨ 𝑗 ∈ {𝑋}))
27 velsn 4184 . . . . . . . . . . 11 (𝑗 ∈ {{𝑍}} ↔ 𝑗 = {𝑍})
28 velsn 4184 . . . . . . . . . . 11 (𝑗 ∈ {𝑋} ↔ 𝑗 = 𝑋)
2927, 28orbi12i 543 . . . . . . . . . 10 ((𝑗 ∈ {{𝑍}} ∨ 𝑗 ∈ {𝑋}) ↔ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋))
3026, 29bitri 264 . . . . . . . . 9 (𝑗 ∈ ({{𝑍}} ∪ {𝑋}) ↔ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋))
3125, 30anbi12i 732 . . . . . . . 8 ((𝑖 ∈ ({{𝑍}} ∪ {𝑋}) ∧ 𝑗 ∈ ({{𝑍}} ∪ {𝑋})) ↔ ((𝑖 = {𝑍} ∨ 𝑖 = 𝑋) ∧ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋)))
3220, 31syl6bb 276 . . . . . . 7 ((Idl‘𝑅) = ({{𝑍}} ∪ {𝑋}) → ((𝑖 ∈ (Idl‘𝑅) ∧ 𝑗 ∈ (Idl‘𝑅)) ↔ ((𝑖 = {𝑍} ∨ 𝑖 = 𝑋) ∧ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋))))
3317, 32sylbi 207 . . . . . 6 ((Idl‘𝑅) = {{𝑍}, 𝑋} → ((𝑖 ∈ (Idl‘𝑅) ∧ 𝑗 ∈ (Idl‘𝑅)) ↔ ((𝑖 = {𝑍} ∨ 𝑖 = 𝑋) ∧ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋))))
34333ad2ant3 1082 . . . . 5 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → ((𝑖 ∈ (Idl‘𝑅) ∧ 𝑗 ∈ (Idl‘𝑅)) ↔ ((𝑖 = {𝑍} ∨ 𝑖 = 𝑋) ∧ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋))))
35 eqimss 3649 . . . . . . . . . . 11 (𝑖 = {𝑍} → 𝑖 ⊆ {𝑍})
3635orcd 407 . . . . . . . . . 10 (𝑖 = {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))
3736adantr 481 . . . . . . . . 9 ((𝑖 = {𝑍} ∧ 𝑗 = {𝑍}) → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))
3837a1d 25 . . . . . . . 8 ((𝑖 = {𝑍} ∧ 𝑗 = {𝑍}) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))
3938a1i 11 . . . . . . 7 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ((𝑖 = {𝑍} ∧ 𝑗 = {𝑍}) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
40 eqimss 3649 . . . . . . . . . . 11 (𝑗 = {𝑍} → 𝑗 ⊆ {𝑍})
4140olcd 408 . . . . . . . . . 10 (𝑗 = {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))
4241adantl 482 . . . . . . . . 9 ((𝑖 = 𝑋𝑗 = {𝑍}) → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))
4342a1d 25 . . . . . . . 8 ((𝑖 = 𝑋𝑗 = {𝑍}) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))
4443a1i 11 . . . . . . 7 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ((𝑖 = 𝑋𝑗 = {𝑍}) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
4536adantr 481 . . . . . . . . 9 ((𝑖 = {𝑍} ∧ 𝑗 = 𝑋) → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))
4645a1d 25 . . . . . . . 8 ((𝑖 = {𝑍} ∧ 𝑗 = 𝑋) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))
4746a1i 11 . . . . . . 7 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ((𝑖 = {𝑍} ∧ 𝑗 = 𝑋) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
482rneqi 5341 . . . . . . . . . . . . . 14 ran 𝐺 = ran (1st𝑅)
497, 48eqtri 2642 . . . . . . . . . . . . 13 𝑋 = ran (1st𝑅)
5049, 6, 8rngo1cl 33709 . . . . . . . . . . . 12 (𝑅 ∈ RingOps → 𝑈𝑋)
5150adantr 481 . . . . . . . . . . 11 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → 𝑈𝑋)
526, 49, 8rngolidm 33707 . . . . . . . . . . . . . . . 16 ((𝑅 ∈ RingOps ∧ 𝑈𝑋) → (𝑈𝐻𝑈) = 𝑈)
5350, 52mpdan 701 . . . . . . . . . . . . . . 15 (𝑅 ∈ RingOps → (𝑈𝐻𝑈) = 𝑈)
5453eleq1d 2684 . . . . . . . . . . . . . 14 (𝑅 ∈ RingOps → ((𝑈𝐻𝑈) ∈ {𝑍} ↔ 𝑈 ∈ {𝑍}))
55 fvex 6188 . . . . . . . . . . . . . . . 16 (GId‘𝐻) ∈ V
568, 55eqeltri 2695 . . . . . . . . . . . . . . 15 𝑈 ∈ V
5756elsn 4183 . . . . . . . . . . . . . 14 (𝑈 ∈ {𝑍} ↔ 𝑈 = 𝑍)
5854, 57syl6bb 276 . . . . . . . . . . . . 13 (𝑅 ∈ RingOps → ((𝑈𝐻𝑈) ∈ {𝑍} ↔ 𝑈 = 𝑍))
5958necon3bbid 2828 . . . . . . . . . . . 12 (𝑅 ∈ RingOps → (¬ (𝑈𝐻𝑈) ∈ {𝑍} ↔ 𝑈𝑍))
6059biimpar 502 . . . . . . . . . . 11 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ¬ (𝑈𝐻𝑈) ∈ {𝑍})
61 oveq1 6642 . . . . . . . . . . . . . 14 (𝑥 = 𝑈 → (𝑥𝐻𝑦) = (𝑈𝐻𝑦))
6261eleq1d 2684 . . . . . . . . . . . . 13 (𝑥 = 𝑈 → ((𝑥𝐻𝑦) ∈ {𝑍} ↔ (𝑈𝐻𝑦) ∈ {𝑍}))
6362notbid 308 . . . . . . . . . . . 12 (𝑥 = 𝑈 → (¬ (𝑥𝐻𝑦) ∈ {𝑍} ↔ ¬ (𝑈𝐻𝑦) ∈ {𝑍}))
64 oveq2 6643 . . . . . . . . . . . . . 14 (𝑦 = 𝑈 → (𝑈𝐻𝑦) = (𝑈𝐻𝑈))
6564eleq1d 2684 . . . . . . . . . . . . 13 (𝑦 = 𝑈 → ((𝑈𝐻𝑦) ∈ {𝑍} ↔ (𝑈𝐻𝑈) ∈ {𝑍}))
6665notbid 308 . . . . . . . . . . . 12 (𝑦 = 𝑈 → (¬ (𝑈𝐻𝑦) ∈ {𝑍} ↔ ¬ (𝑈𝐻𝑈) ∈ {𝑍}))
6763, 66rspc2ev 3319 . . . . . . . . . . 11 ((𝑈𝑋𝑈𝑋 ∧ ¬ (𝑈𝐻𝑈) ∈ {𝑍}) → ∃𝑥𝑋𝑦𝑋 ¬ (𝑥𝐻𝑦) ∈ {𝑍})
6851, 51, 60, 67syl3anc 1324 . . . . . . . . . 10 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ∃𝑥𝑋𝑦𝑋 ¬ (𝑥𝐻𝑦) ∈ {𝑍})
69 rexnal2 3039 . . . . . . . . . 10 (∃𝑥𝑋𝑦𝑋 ¬ (𝑥𝐻𝑦) ∈ {𝑍} ↔ ¬ ∀𝑥𝑋𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍})
7068, 69sylib 208 . . . . . . . . 9 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ¬ ∀𝑥𝑋𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍})
7170pm2.21d 118 . . . . . . . 8 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → (∀𝑥𝑋𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))
72 raleq 3133 . . . . . . . . . 10 (𝑖 = 𝑋 → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} ↔ ∀𝑥𝑋𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍}))
73 raleq 3133 . . . . . . . . . . 11 (𝑗 = 𝑋 → (∀𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} ↔ ∀𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍}))
7473ralbidv 2983 . . . . . . . . . 10 (𝑗 = 𝑋 → (∀𝑥𝑋𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} ↔ ∀𝑥𝑋𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍}))
7572, 74sylan9bb 735 . . . . . . . . 9 ((𝑖 = 𝑋𝑗 = 𝑋) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} ↔ ∀𝑥𝑋𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍}))
7675imbi1d 331 . . . . . . . 8 ((𝑖 = 𝑋𝑗 = 𝑋) → ((∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})) ↔ (∀𝑥𝑋𝑦𝑋 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
7771, 76syl5ibrcom 237 . . . . . . 7 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → ((𝑖 = 𝑋𝑗 = 𝑋) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
7839, 44, 47, 77ccased 987 . . . . . 6 ((𝑅 ∈ RingOps ∧ 𝑈𝑍) → (((𝑖 = {𝑍} ∨ 𝑖 = 𝑋) ∧ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋)) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
79783adant3 1079 . . . . 5 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → (((𝑖 = {𝑍} ∨ 𝑖 = 𝑋) ∧ (𝑗 = {𝑍} ∨ 𝑗 = 𝑋)) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
8034, 79sylbid 230 . . . 4 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → ((𝑖 ∈ (Idl‘𝑅) ∧ 𝑗 ∈ (Idl‘𝑅)) → (∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍}))))
8180ralrimivv 2967 . . 3 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → ∀𝑖 ∈ (Idl‘𝑅)∀𝑗 ∈ (Idl‘𝑅)(∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))
822, 6, 7ispridl 33804 . . . 4 (𝑅 ∈ RingOps → ({𝑍} ∈ (PrIdl‘𝑅) ↔ ({𝑍} ∈ (Idl‘𝑅) ∧ {𝑍} ≠ 𝑋 ∧ ∀𝑖 ∈ (Idl‘𝑅)∀𝑗 ∈ (Idl‘𝑅)(∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))))
83823ad2ant1 1080 . . 3 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → ({𝑍} ∈ (PrIdl‘𝑅) ↔ ({𝑍} ∈ (Idl‘𝑅) ∧ {𝑍} ≠ 𝑋 ∧ ∀𝑖 ∈ (Idl‘𝑅)∀𝑗 ∈ (Idl‘𝑅)(∀𝑥𝑖𝑦𝑗 (𝑥𝐻𝑦) ∈ {𝑍} → (𝑖 ⊆ {𝑍} ∨ 𝑗 ⊆ {𝑍})))))
845, 15, 81, 83mpbir3and 1243 . 2 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → {𝑍} ∈ (PrIdl‘𝑅))
852, 3isprrngo 33820 . 2 (𝑅 ∈ PrRing ↔ (𝑅 ∈ RingOps ∧ {𝑍} ∈ (PrIdl‘𝑅)))
861, 84, 85sylanbrc 697 1 ((𝑅 ∈ RingOps ∧ 𝑈𝑍 ∧ (Idl‘𝑅) = {{𝑍}, 𝑋}) → 𝑅 ∈ PrRing)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 383  wa 384  w3a 1036   = wceq 1481  wcel 1988  wne 2791  wral 2909  wrex 2910  Vcvv 3195  cun 3565  wss 3567  {csn 4168  {cpr 4170  ran crn 5105  cfv 5876  (class class class)co 6635  1st c1st 7151  2nd c2nd 7152  GIdcgi 27314  RingOpscrngo 33664  Idlcidl 33777  PrIdlcpridl 33778  PrRingcprrng 33816
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1720  ax-4 1735  ax-5 1837  ax-6 1886  ax-7 1933  ax-8 1990  ax-9 1997  ax-10 2017  ax-11 2032  ax-12 2045  ax-13 2244  ax-ext 2600  ax-rep 4762  ax-sep 4772  ax-nul 4780  ax-pow 4834  ax-pr 4897  ax-un 6934
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1038  df-tru 1484  df-ex 1703  df-nf 1708  df-sb 1879  df-eu 2472  df-mo 2473  df-clab 2607  df-cleq 2613  df-clel 2616  df-nfc 2751  df-ne 2792  df-ral 2914  df-rex 2915  df-reu 2916  df-rmo 2917  df-rab 2918  df-v 3197  df-sbc 3430  df-csb 3527  df-dif 3570  df-un 3572  df-in 3574  df-ss 3581  df-nul 3908  df-if 4078  df-pw 4151  df-sn 4169  df-pr 4171  df-op 4175  df-uni 4428  df-iun 4513  df-br 4645  df-opab 4704  df-mpt 4721  df-id 5014  df-xp 5110  df-rel 5111  df-cnv 5112  df-co 5113  df-dm 5114  df-rn 5115  df-res 5116  df-ima 5117  df-iota 5839  df-fun 5878  df-fn 5879  df-f 5880  df-f1 5881  df-fo 5882  df-f1o 5883  df-fv 5884  df-riota 6596  df-ov 6638  df-1st 7153  df-2nd 7154  df-grpo 27317  df-gid 27318  df-ginv 27319  df-ablo 27369  df-ass 33613  df-exid 33615  df-mgmOLD 33619  df-sgrOLD 33631  df-mndo 33637  df-rngo 33665  df-idl 33780  df-pridl 33781  df-prrngo 33818
This theorem is referenced by:  divrngpr  33823
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