| Step | Hyp | Ref
| Expression |
| 1 | | eluzelz 9940 |
. . . . 5
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑁 ∈ ℤ) |
| 2 | | eluzel2 9935 |
. . . . . . 7
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑀 ∈ ℤ) |
| 3 | | 2z 9676 |
. . . . . . 7
⊢ 2 ∈
ℤ |
| 4 | | zmincl 12020 |
. . . . . . 7
⊢ ((𝑀 ∈ ℤ ∧ 2 ∈
ℤ) → inf({𝑀, 2},
ℝ, < ) ∈ ℤ) |
| 5 | 2, 3, 4 | sylancl 417 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → inf({𝑀, 2}, ℝ, < ) ∈
ℤ) |
| 6 | 3 | a1i 9 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 2 ∈ ℤ) |
| 7 | 2 | zred 9772 |
. . . . . . 7
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑀 ∈ ℝ) |
| 8 | | 2re 9376 |
. . . . . . 7
⊢ 2 ∈
ℝ |
| 9 | | min2inf 12014 |
. . . . . . 7
⊢ ((𝑀 ∈ ℝ ∧ 2 ∈
ℝ) → inf({𝑀, 2},
ℝ, < ) ≤ 2) |
| 10 | 7, 8, 9 | sylancl 417 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → inf({𝑀, 2}, ℝ, < ) ≤
2) |
| 11 | | eluz2 9936 |
. . . . . 6
⊢ (2 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < )) ↔ (inf({𝑀, 2}, ℝ, < ) ∈
ℤ ∧ 2 ∈ ℤ ∧ inf({𝑀, 2}, ℝ, < ) ≤
2)) |
| 12 | 5, 6, 10, 11 | syl3anbrc 1212 |
. . . . 5
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 2 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < ))) |
| 13 | | ppival2g 16162 |
. . . . 5
⊢ ((𝑁 ∈ ℤ ∧ 2 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < ))) →
(π‘𝑁) =
(♯‘((inf({𝑀,
2}, ℝ, < )...𝑁)
∩ ℙ))) |
| 14 | 1, 12, 13 | syl2anc 415 |
. . . 4
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (π‘𝑁) = (♯‘((inf({𝑀, 2}, ℝ, < )...𝑁) ∩
ℙ))) |
| 15 | | min1inf 12013 |
. . . . . . . . . . 11
⊢ ((𝑀 ∈ ℝ ∧ 2 ∈
ℝ) → inf({𝑀, 2},
ℝ, < ) ≤ 𝑀) |
| 16 | 7, 8, 15 | sylancl 417 |
. . . . . . . . . 10
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → inf({𝑀, 2}, ℝ, < ) ≤ 𝑀) |
| 17 | | eluz2 9936 |
. . . . . . . . . 10
⊢ (𝑀 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < )) ↔ (inf({𝑀, 2}, ℝ, < ) ∈
ℤ ∧ 𝑀 ∈
ℤ ∧ inf({𝑀, 2},
ℝ, < ) ≤ 𝑀)) |
| 18 | 5, 2, 16, 17 | syl3anbrc 1212 |
. . . . . . . . 9
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑀 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < ))) |
| 19 | | id 19 |
. . . . . . . . 9
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑁 ∈ (ℤ≥‘𝑀)) |
| 20 | | elfzuzb 10432 |
. . . . . . . . 9
⊢ (𝑀 ∈ (inf({𝑀, 2}, ℝ, < )...𝑁) ↔ (𝑀 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < )) ∧ 𝑁 ∈
(ℤ≥‘𝑀))) |
| 21 | 18, 19, 20 | sylanbrc 421 |
. . . . . . . 8
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑀 ∈ (inf({𝑀, 2}, ℝ, < )...𝑁)) |
| 22 | | fzsplit 10466 |
. . . . . . . 8
⊢ (𝑀 ∈ (inf({𝑀, 2}, ℝ, < )...𝑁) → (inf({𝑀, 2}, ℝ, < )...𝑁) = ((inf({𝑀, 2}, ℝ, < )...𝑀) ∪ ((𝑀 + 1)...𝑁))) |
| 23 | 21, 22 | syl 14 |
. . . . . . 7
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (inf({𝑀, 2}, ℝ, < )...𝑁) = ((inf({𝑀, 2}, ℝ, < )...𝑀) ∪ ((𝑀 + 1)...𝑁))) |
| 24 | 23 | ineq1d 3431 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((inf({𝑀, 2}, ℝ, < )...𝑁) ∩ ℙ) = (((inf({𝑀, 2}, ℝ, < )...𝑀) ∪ ((𝑀 + 1)...𝑁)) ∩ ℙ)) |
| 25 | | indir 3480 |
. . . . . 6
⊢
(((inf({𝑀, 2},
ℝ, < )...𝑀) ∪
((𝑀 + 1)...𝑁)) ∩ ℙ) =
(((inf({𝑀, 2}, ℝ,
< )...𝑀) ∩ ℙ)
∪ (((𝑀 + 1)...𝑁) ∩
ℙ)) |
| 26 | 24, 25 | eqtrdi 2287 |
. . . . 5
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((inf({𝑀, 2}, ℝ, < )...𝑁) ∩ ℙ) = (((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ∪ (((𝑀 + 1)...𝑁) ∩ ℙ))) |
| 27 | 26 | fveq2d 5699 |
. . . 4
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (♯‘((inf({𝑀, 2}, ℝ, < )...𝑁) ∩ ℙ)) =
(♯‘(((inf({𝑀,
2}, ℝ, < )...𝑀)
∩ ℙ) ∪ (((𝑀 +
1)...𝑁) ∩
ℙ)))) |
| 28 | 5, 2 | fzfigd 10881 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (inf({𝑀, 2}, ℝ, < )...𝑀) ∈ Fin) |
| 29 | | inss1 3451 |
. . . . . . 7
⊢
((inf({𝑀, 2},
ℝ, < )...𝑀) ∩
ℙ) ⊆ (inf({𝑀,
2}, ℝ, < )...𝑀) |
| 30 | 29 | a1i 9 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ⊆ (inf({𝑀, 2}, ℝ, < )...𝑀)) |
| 31 | | animorrl 838 |
. . . . . . . . . 10
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) → (𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) ∨ ¬ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀))) |
| 32 | | df-dc 847 |
. . . . . . . . . 10
⊢
(DECID 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) ↔ (𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) ∨ ¬ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀))) |
| 33 | 31, 32 | sylibr 134 |
. . . . . . . . 9
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) → DECID 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) |
| 34 | | elfzelz 10438 |
. . . . . . . . . . 11
⊢ (𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) → 𝑥 ∈ ℤ) |
| 35 | 34 | adantl 277 |
. . . . . . . . . 10
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) → 𝑥 ∈ ℤ) |
| 36 | | prmdcz 12925 |
. . . . . . . . . 10
⊢ (𝑥 ∈ ℤ →
DECID 𝑥
∈ ℙ) |
| 37 | 35, 36 | syl 14 |
. . . . . . . . 9
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) → DECID 𝑥 ∈
ℙ) |
| 38 | 33, 37 | dcand 945 |
. . . . . . . 8
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) → DECID (𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) ∧ 𝑥 ∈ ℙ)) |
| 39 | | elin 3412 |
. . . . . . . . 9
⊢ (𝑥 ∈ ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ↔ (𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) ∧ 𝑥 ∈ ℙ)) |
| 40 | 39 | dcbii 852 |
. . . . . . . 8
⊢
(DECID 𝑥 ∈ ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ↔ DECID
(𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀) ∧ 𝑥 ∈ ℙ)) |
| 41 | 38, 40 | sylibr 134 |
. . . . . . 7
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)) → DECID 𝑥 ∈ ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) |
| 42 | 41 | ralrimiva 2623 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ∀𝑥 ∈ (inf({𝑀, 2}, ℝ, < )...𝑀)DECID 𝑥 ∈ ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) |
| 43 | | ssfidc 7245 |
. . . . . 6
⊢
(((inf({𝑀, 2},
ℝ, < )...𝑀) ∈
Fin ∧ ((inf({𝑀, 2},
ℝ, < )...𝑀) ∩
ℙ) ⊆ (inf({𝑀,
2}, ℝ, < )...𝑀)
∧ ∀𝑥 ∈
(inf({𝑀, 2}, ℝ, <
)...𝑀)DECID
𝑥 ∈ ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) →
((inf({𝑀, 2}, ℝ, <
)...𝑀) ∩ ℙ)
∈ Fin) |
| 44 | 28, 30, 42, 43 | syl3anc 1278 |
. . . . 5
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ∈
Fin) |
| 45 | 2 | peano2zd 9775 |
. . . . . . 7
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (𝑀 + 1) ∈ ℤ) |
| 46 | 45, 1 | fzfigd 10881 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((𝑀 + 1)...𝑁) ∈ Fin) |
| 47 | | inss1 3451 |
. . . . . . 7
⊢ (((𝑀 + 1)...𝑁) ∩ ℙ) ⊆ ((𝑀 + 1)...𝑁) |
| 48 | 47 | a1i 9 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (((𝑀 + 1)...𝑁) ∩ ℙ) ⊆ ((𝑀 + 1)...𝑁)) |
| 49 | | orc 724 |
. . . . . . . . . . 11
⊢ (𝑥 ∈ ((𝑀 + 1)...𝑁) → (𝑥 ∈ ((𝑀 + 1)...𝑁) ∨ ¬ 𝑥 ∈ ((𝑀 + 1)...𝑁))) |
| 50 | | df-dc 847 |
. . . . . . . . . . 11
⊢
(DECID 𝑥 ∈ ((𝑀 + 1)...𝑁) ↔ (𝑥 ∈ ((𝑀 + 1)...𝑁) ∨ ¬ 𝑥 ∈ ((𝑀 + 1)...𝑁))) |
| 51 | 49, 50 | sylibr 134 |
. . . . . . . . . 10
⊢ (𝑥 ∈ ((𝑀 + 1)...𝑁) → DECID 𝑥 ∈ ((𝑀 + 1)...𝑁)) |
| 52 | 51 | adantl 277 |
. . . . . . . . 9
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ ((𝑀 + 1)...𝑁)) → DECID 𝑥 ∈ ((𝑀 + 1)...𝑁)) |
| 53 | | elfzelz 10438 |
. . . . . . . . . . 11
⊢ (𝑥 ∈ ((𝑀 + 1)...𝑁) → 𝑥 ∈ ℤ) |
| 54 | 53, 36 | syl 14 |
. . . . . . . . . 10
⊢ (𝑥 ∈ ((𝑀 + 1)...𝑁) → DECID 𝑥 ∈
ℙ) |
| 55 | 54 | adantl 277 |
. . . . . . . . 9
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ ((𝑀 + 1)...𝑁)) → DECID 𝑥 ∈
ℙ) |
| 56 | 52, 55 | dcand 945 |
. . . . . . . 8
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ ((𝑀 + 1)...𝑁)) → DECID (𝑥 ∈ ((𝑀 + 1)...𝑁) ∧ 𝑥 ∈ ℙ)) |
| 57 | | elin 3412 |
. . . . . . . . 9
⊢ (𝑥 ∈ (((𝑀 + 1)...𝑁) ∩ ℙ) ↔ (𝑥 ∈ ((𝑀 + 1)...𝑁) ∧ 𝑥 ∈ ℙ)) |
| 58 | 57 | dcbii 852 |
. . . . . . . 8
⊢
(DECID 𝑥 ∈ (((𝑀 + 1)...𝑁) ∩ ℙ) ↔ DECID
(𝑥 ∈ ((𝑀 + 1)...𝑁) ∧ 𝑥 ∈ ℙ)) |
| 59 | 56, 58 | sylibr 134 |
. . . . . . 7
⊢ ((𝑁 ∈
(ℤ≥‘𝑀) ∧ 𝑥 ∈ ((𝑀 + 1)...𝑁)) → DECID 𝑥 ∈ (((𝑀 + 1)...𝑁) ∩ ℙ)) |
| 60 | 59 | ralrimiva 2623 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ∀𝑥 ∈ ((𝑀 + 1)...𝑁)DECID 𝑥 ∈ (((𝑀 + 1)...𝑁) ∩ ℙ)) |
| 61 | | ssfidc 7245 |
. . . . . 6
⊢ ((((𝑀 + 1)...𝑁) ∈ Fin ∧ (((𝑀 + 1)...𝑁) ∩ ℙ) ⊆ ((𝑀 + 1)...𝑁) ∧ ∀𝑥 ∈ ((𝑀 + 1)...𝑁)DECID 𝑥 ∈ (((𝑀 + 1)...𝑁) ∩ ℙ)) → (((𝑀 + 1)...𝑁) ∩ ℙ) ∈
Fin) |
| 62 | 46, 48, 60, 61 | syl3anc 1278 |
. . . . 5
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (((𝑀 + 1)...𝑁) ∩ ℙ) ∈
Fin) |
| 63 | 7 | ltp1d 9262 |
. . . . . . . 8
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → 𝑀 < (𝑀 + 1)) |
| 64 | | fzdisj 10467 |
. . . . . . . 8
⊢ (𝑀 < (𝑀 + 1) → ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ((𝑀 + 1)...𝑁)) = ∅) |
| 65 | 63, 64 | syl 14 |
. . . . . . 7
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ((𝑀 + 1)...𝑁)) = ∅) |
| 66 | 65 | ineq1d 3431 |
. . . . . 6
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ((𝑀 + 1)...𝑁)) ∩ ℙ) = (∅ ∩
ℙ)) |
| 67 | | inindir 3449 |
. . . . . 6
⊢
(((inf({𝑀, 2},
ℝ, < )...𝑀) ∩
((𝑀 + 1)...𝑁)) ∩ ℙ) =
(((inf({𝑀, 2}, ℝ,
< )...𝑀) ∩ ℙ)
∩ (((𝑀 + 1)...𝑁) ∩
ℙ)) |
| 68 | | 0in 3558 |
. . . . . 6
⊢ (∅
∩ ℙ) = ∅ |
| 69 | 66, 67, 68 | 3eqtr3g 2294 |
. . . . 5
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ∩ (((𝑀 + 1)...𝑁) ∩ ℙ)) =
∅) |
| 70 | | hashun 11259 |
. . . . 5
⊢
((((inf({𝑀, 2},
ℝ, < )...𝑀) ∩
ℙ) ∈ Fin ∧ (((𝑀 + 1)...𝑁) ∩ ℙ) ∈ Fin ∧
(((inf({𝑀, 2}, ℝ,
< )...𝑀) ∩ ℙ)
∩ (((𝑀 + 1)...𝑁) ∩ ℙ)) = ∅)
→ (♯‘(((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ∪ (((𝑀 + 1)...𝑁) ∩ ℙ))) =
((♯‘((inf({𝑀,
2}, ℝ, < )...𝑀)
∩ ℙ)) + (♯‘(((𝑀 + 1)...𝑁) ∩ ℙ)))) |
| 71 | 44, 62, 69, 70 | syl3anc 1278 |
. . . 4
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (♯‘(((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ) ∪ (((𝑀 + 1)...𝑁) ∩ ℙ))) =
((♯‘((inf({𝑀,
2}, ℝ, < )...𝑀)
∩ ℙ)) + (♯‘(((𝑀 + 1)...𝑁) ∩ ℙ)))) |
| 72 | 14, 27, 71 | 3eqtrd 2275 |
. . 3
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (π‘𝑁) = ((♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) +
(♯‘(((𝑀 +
1)...𝑁) ∩
ℙ)))) |
| 73 | | ppival2g 16162 |
. . . 4
⊢ ((𝑀 ∈ ℤ ∧ 2 ∈
(ℤ≥‘inf({𝑀, 2}, ℝ, < ))) →
(π‘𝑀) =
(♯‘((inf({𝑀,
2}, ℝ, < )...𝑀)
∩ ℙ))) |
| 74 | 2, 12, 73 | syl2anc 415 |
. . 3
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (π‘𝑀) = (♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩
ℙ))) |
| 75 | 72, 74 | oveq12d 6103 |
. 2
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((π‘𝑁) −
(π‘𝑀)) =
(((♯‘((inf({𝑀,
2}, ℝ, < )...𝑀)
∩ ℙ)) + (♯‘(((𝑀 + 1)...𝑁) ∩ ℙ))) −
(♯‘((inf({𝑀,
2}, ℝ, < )...𝑀)
∩ ℙ)))) |
| 76 | | hashcl 11234 |
. . . . 5
⊢
(((inf({𝑀, 2},
ℝ, < )...𝑀) ∩
ℙ) ∈ Fin → (♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) ∈
ℕ0) |
| 77 | 44, 76 | syl 14 |
. . . 4
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) ∈
ℕ0) |
| 78 | 77 | nn0cnd 9626 |
. . 3
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) ∈
ℂ) |
| 79 | | hashcl 11234 |
. . . . 5
⊢ ((((𝑀 + 1)...𝑁) ∩ ℙ) ∈ Fin →
(♯‘(((𝑀 +
1)...𝑁) ∩ ℙ))
∈ ℕ0) |
| 80 | 62, 79 | syl 14 |
. . . 4
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (♯‘(((𝑀 + 1)...𝑁) ∩ ℙ)) ∈
ℕ0) |
| 81 | 80 | nn0cnd 9626 |
. . 3
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (♯‘(((𝑀 + 1)...𝑁) ∩ ℙ)) ∈
ℂ) |
| 82 | 78, 81 | pncan2d 8640 |
. 2
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → (((♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ)) +
(♯‘(((𝑀 +
1)...𝑁) ∩ ℙ)))
− (♯‘((inf({𝑀, 2}, ℝ, < )...𝑀) ∩ ℙ))) = (♯‘(((𝑀 + 1)...𝑁) ∩ ℙ))) |
| 83 | 75, 82 | eqtrd 2271 |
1
⊢ (𝑁 ∈
(ℤ≥‘𝑀) → ((π‘𝑁) −
(π‘𝑀)) =
(♯‘(((𝑀 +
1)...𝑁) ∩
ℙ))) |