Proof of Theorem nprmmul3
| Step | Hyp | Ref
| Expression |
| 1 | | nprmmul2 47985 |
. 2
⊢ (𝑁 ∈
(ℤ≥‘4) → (𝑁 ∉ ℙ ↔ ∃𝑎 ∈ (2..^𝑁)∃𝑏 ∈ (2..^𝑁)(𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)))) |
| 2 | | elfzoelz 13602 |
. . . . . . . . . . 11
⊢ (𝑎 ∈ (2..^𝑁) → 𝑎 ∈ ℤ) |
| 3 | 2 | zred 12622 |
. . . . . . . . . 10
⊢ (𝑎 ∈ (2..^𝑁) → 𝑎 ∈ ℝ) |
| 4 | 3 | adantl 481 |
. . . . . . . . 9
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → 𝑎 ∈ ℝ) |
| 5 | | elfzoelz 13602 |
. . . . . . . . . 10
⊢ (𝑏 ∈ (2..^𝑁) → 𝑏 ∈ ℤ) |
| 6 | 5 | zred 12622 |
. . . . . . . . 9
⊢ (𝑏 ∈ (2..^𝑁) → 𝑏 ∈ ℝ) |
| 7 | | leloe 11221 |
. . . . . . . . 9
⊢ ((𝑎 ∈ ℝ ∧ 𝑏 ∈ ℝ) → (𝑎 ≤ 𝑏 ↔ (𝑎 < 𝑏 ∨ 𝑎 = 𝑏))) |
| 8 | 4, 6, 7 | syl2an 597 |
. . . . . . . 8
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑏 ∈ (2..^𝑁)) → (𝑎 ≤ 𝑏 ↔ (𝑎 < 𝑏 ∨ 𝑎 = 𝑏))) |
| 9 | 8 | anbi1d 632 |
. . . . . . 7
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑏 ∈ (2..^𝑁)) → ((𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ ((𝑎 < 𝑏 ∨ 𝑎 = 𝑏) ∧ 𝑁 = (𝑎 · 𝑏)))) |
| 10 | | andir 1011 |
. . . . . . 7
⊢ (((𝑎 < 𝑏 ∨ 𝑎 = 𝑏) ∧ 𝑁 = (𝑎 · 𝑏)) ↔ ((𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ (𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)))) |
| 11 | 9, 10 | bitrdi 287 |
. . . . . 6
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑏 ∈ (2..^𝑁)) → ((𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ ((𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ (𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏))))) |
| 12 | 11 | rexbidva 3160 |
. . . . 5
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (∃𝑏 ∈ (2..^𝑁)(𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ ∃𝑏 ∈ (2..^𝑁)((𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ (𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏))))) |
| 13 | | r19.43 3106 |
. . . . . 6
⊢
(∃𝑏 ∈
(2..^𝑁)((𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ (𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏))) ↔ (∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ ∃𝑏 ∈ (2..^𝑁)(𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)))) |
| 14 | | oveq2 7366 |
. . . . . . . . . . . . . . . . . 18
⊢ (𝑏 = 𝑎 → (𝑎 · 𝑏) = (𝑎 · 𝑎)) |
| 15 | 14 | equcoms 2022 |
. . . . . . . . . . . . . . . . 17
⊢ (𝑎 = 𝑏 → (𝑎 · 𝑏) = (𝑎 · 𝑎)) |
| 16 | 15 | adantl 481 |
. . . . . . . . . . . . . . . 16
⊢ ((𝑎 ∈ (2..^𝑁) ∧ 𝑎 = 𝑏) → (𝑎 · 𝑏) = (𝑎 · 𝑎)) |
| 17 | 2 | zcnd 12623 |
. . . . . . . . . . . . . . . . . 18
⊢ (𝑎 ∈ (2..^𝑁) → 𝑎 ∈ ℂ) |
| 18 | 17 | sqvald 14094 |
. . . . . . . . . . . . . . . . 17
⊢ (𝑎 ∈ (2..^𝑁) → (𝑎↑2) = (𝑎 · 𝑎)) |
| 19 | 18 | adantr 480 |
. . . . . . . . . . . . . . . 16
⊢ ((𝑎 ∈ (2..^𝑁) ∧ 𝑎 = 𝑏) → (𝑎↑2) = (𝑎 · 𝑎)) |
| 20 | 16, 19 | eqtr4d 2775 |
. . . . . . . . . . . . . . 15
⊢ ((𝑎 ∈ (2..^𝑁) ∧ 𝑎 = 𝑏) → (𝑎 · 𝑏) = (𝑎↑2)) |
| 21 | 20 | eqeq2d 2748 |
. . . . . . . . . . . . . 14
⊢ ((𝑎 ∈ (2..^𝑁) ∧ 𝑎 = 𝑏) → (𝑁 = (𝑎 · 𝑏) ↔ 𝑁 = (𝑎↑2))) |
| 22 | 21 | biimpd 229 |
. . . . . . . . . . . . 13
⊢ ((𝑎 ∈ (2..^𝑁) ∧ 𝑎 = 𝑏) → (𝑁 = (𝑎 · 𝑏) → 𝑁 = (𝑎↑2))) |
| 23 | 22 | ex 412 |
. . . . . . . . . . . 12
⊢ (𝑎 ∈ (2..^𝑁) → (𝑎 = 𝑏 → (𝑁 = (𝑎 · 𝑏) → 𝑁 = (𝑎↑2)))) |
| 24 | 23 | adantl 481 |
. . . . . . . . . . 11
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (𝑎 = 𝑏 → (𝑁 = (𝑎 · 𝑏) → 𝑁 = (𝑎↑2)))) |
| 25 | 24 | impd 410 |
. . . . . . . . . 10
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → ((𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) → 𝑁 = (𝑎↑2))) |
| 26 | 25 | a1d 25 |
. . . . . . . . 9
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (𝑏 ∈ (2..^𝑁) → ((𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) → 𝑁 = (𝑎↑2)))) |
| 27 | 26 | rexlimdv 3137 |
. . . . . . . 8
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (∃𝑏 ∈ (2..^𝑁)(𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) → 𝑁 = (𝑎↑2))) |
| 28 | | simplr 769 |
. . . . . . . . . 10
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑁 = (𝑎↑2)) → 𝑎 ∈ (2..^𝑁)) |
| 29 | | equequ2 2028 |
. . . . . . . . . . . 12
⊢ (𝑏 = 𝑎 → (𝑎 = 𝑏 ↔ 𝑎 = 𝑎)) |
| 30 | 14 | eqeq2d 2748 |
. . . . . . . . . . . 12
⊢ (𝑏 = 𝑎 → (𝑁 = (𝑎 · 𝑏) ↔ 𝑁 = (𝑎 · 𝑎))) |
| 31 | 29, 30 | anbi12d 633 |
. . . . . . . . . . 11
⊢ (𝑏 = 𝑎 → ((𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ (𝑎 = 𝑎 ∧ 𝑁 = (𝑎 · 𝑎)))) |
| 32 | 31 | adantl 481 |
. . . . . . . . . 10
⊢ ((((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑁 = (𝑎↑2)) ∧ 𝑏 = 𝑎) → ((𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ (𝑎 = 𝑎 ∧ 𝑁 = (𝑎 · 𝑎)))) |
| 33 | 18 | eqeq2d 2748 |
. . . . . . . . . . . . . 14
⊢ (𝑎 ∈ (2..^𝑁) → (𝑁 = (𝑎↑2) ↔ 𝑁 = (𝑎 · 𝑎))) |
| 34 | 33 | biimpd 229 |
. . . . . . . . . . . . 13
⊢ (𝑎 ∈ (2..^𝑁) → (𝑁 = (𝑎↑2) → 𝑁 = (𝑎 · 𝑎))) |
| 35 | 34 | adantl 481 |
. . . . . . . . . . . 12
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (𝑁 = (𝑎↑2) → 𝑁 = (𝑎 · 𝑎))) |
| 36 | 35 | imp 406 |
. . . . . . . . . . 11
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑁 = (𝑎↑2)) → 𝑁 = (𝑎 · 𝑎)) |
| 37 | | equid 2014 |
. . . . . . . . . . 11
⊢ 𝑎 = 𝑎 |
| 38 | 36, 37 | jctil 519 |
. . . . . . . . . 10
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑁 = (𝑎↑2)) → (𝑎 = 𝑎 ∧ 𝑁 = (𝑎 · 𝑎))) |
| 39 | 28, 32, 38 | rspcedvd 3567 |
. . . . . . . . 9
⊢ (((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) ∧ 𝑁 = (𝑎↑2)) → ∃𝑏 ∈ (2..^𝑁)(𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏))) |
| 40 | 39 | ex 412 |
. . . . . . . 8
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (𝑁 = (𝑎↑2) → ∃𝑏 ∈ (2..^𝑁)(𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)))) |
| 41 | 27, 40 | impbid 212 |
. . . . . . 7
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (∃𝑏 ∈ (2..^𝑁)(𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ 𝑁 = (𝑎↑2))) |
| 42 | 41 | orbi2d 916 |
. . . . . 6
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → ((∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ ∃𝑏 ∈ (2..^𝑁)(𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏))) ↔ (∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ 𝑁 = (𝑎↑2)))) |
| 43 | 13, 42 | bitrid 283 |
. . . . 5
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (∃𝑏 ∈ (2..^𝑁)((𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ (𝑎 = 𝑏 ∧ 𝑁 = (𝑎 · 𝑏))) ↔ (∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ 𝑁 = (𝑎↑2)))) |
| 44 | 12, 43 | bitrd 279 |
. . . 4
⊢ ((𝑁 ∈
(ℤ≥‘4) ∧ 𝑎 ∈ (2..^𝑁)) → (∃𝑏 ∈ (2..^𝑁)(𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ (∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ 𝑁 = (𝑎↑2)))) |
| 45 | 44 | rexbidva 3160 |
. . 3
⊢ (𝑁 ∈
(ℤ≥‘4) → (∃𝑎 ∈ (2..^𝑁)∃𝑏 ∈ (2..^𝑁)(𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ ∃𝑎 ∈ (2..^𝑁)(∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ 𝑁 = (𝑎↑2)))) |
| 46 | | r19.43 3106 |
. . 3
⊢
(∃𝑎 ∈
(2..^𝑁)(∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ 𝑁 = (𝑎↑2)) ↔ (∃𝑎 ∈ (2..^𝑁)∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ ∃𝑎 ∈ (2..^𝑁)𝑁 = (𝑎↑2))) |
| 47 | 45, 46 | bitrdi 287 |
. 2
⊢ (𝑁 ∈
(ℤ≥‘4) → (∃𝑎 ∈ (2..^𝑁)∃𝑏 ∈ (2..^𝑁)(𝑎 ≤ 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ↔ (∃𝑎 ∈ (2..^𝑁)∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ ∃𝑎 ∈ (2..^𝑁)𝑁 = (𝑎↑2)))) |
| 48 | 1, 47 | bitrd 279 |
1
⊢ (𝑁 ∈
(ℤ≥‘4) → (𝑁 ∉ ℙ ↔ (∃𝑎 ∈ (2..^𝑁)∃𝑏 ∈ (2..^𝑁)(𝑎 < 𝑏 ∧ 𝑁 = (𝑎 · 𝑏)) ∨ ∃𝑎 ∈ (2..^𝑁)𝑁 = (𝑎↑2)))) |