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| Mirrors > Home > MPE Home > Th. List > ncoprmgcdne1b | Structured version Visualization version GIF version | ||
| Description: Two positive integers are not coprime, i.e. there is an integer greater than 1 which divides both integers, iff their greatest common divisor is not 1. See prmdvdsncoprmbd 16812 for a version where the existential quantifier is restricted to primes. (Contributed by AV, 9-Aug-2020.) |
| Ref | Expression |
|---|---|
| ncoprmgcdne1b | ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (∃𝑖 ∈ (ℤ≥‘2)(𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ↔ (𝐴 gcd 𝐵) ≠ 1)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluz2nn 12932 | . . . . . 6 ⊢ (𝑖 ∈ (ℤ≥‘2) → 𝑖 ∈ ℕ) | |
| 2 | 1 | adantr 486 | . . . . 5 ⊢ ((𝑖 ∈ (ℤ≥‘2) ∧ (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵)) → 𝑖 ∈ ℕ) |
| 3 | eluz2b3 12966 | . . . . . . 7 ⊢ (𝑖 ∈ (ℤ≥‘2) ↔ (𝑖 ∈ ℕ ∧ 𝑖 ≠ 1)) | |
| 4 | neneq 2966 | . . . . . . 7 ⊢ (𝑖 ≠ 1 → ¬ 𝑖 = 1) | |
| 5 | 3, 4 | simplbiim 514 | . . . . . 6 ⊢ (𝑖 ∈ (ℤ≥‘2) → ¬ 𝑖 = 1) |
| 6 | 5 | anim1ci 628 | . . . . 5 ⊢ ((𝑖 ∈ (ℤ≥‘2) ∧ (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵)) → ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1)) |
| 7 | 2, 6 | jca 521 | . . . 4 ⊢ ((𝑖 ∈ (ℤ≥‘2) ∧ (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵)) → (𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1))) |
| 8 | neqne 2968 | . . . . . . . . . . . 12 ⊢ (¬ 𝑖 = 1 → 𝑖 ≠ 1) | |
| 9 | 8 | anim1ci 628 | . . . . . . . . . . 11 ⊢ ((¬ 𝑖 = 1 ∧ 𝑖 ∈ ℕ) → (𝑖 ∈ ℕ ∧ 𝑖 ≠ 1)) |
| 10 | 9, 3 | sylibr 237 | . . . . . . . . . 10 ⊢ ((¬ 𝑖 = 1 ∧ 𝑖 ∈ ℕ) → 𝑖 ∈ (ℤ≥‘2)) |
| 11 | 10 | ex 418 | . . . . . . . . 9 ⊢ (¬ 𝑖 = 1 → (𝑖 ∈ ℕ → 𝑖 ∈ (ℤ≥‘2))) |
| 12 | 11 | adantl 487 | . . . . . . . 8 ⊢ (((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1) → (𝑖 ∈ ℕ → 𝑖 ∈ (ℤ≥‘2))) |
| 13 | 12 | impcom 413 | . . . . . . 7 ⊢ ((𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1)) → 𝑖 ∈ (ℤ≥‘2)) |
| 14 | 13 | adantl 487 | . . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1))) → 𝑖 ∈ (ℤ≥‘2)) |
| 15 | simprrl 793 | . . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1))) → (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵)) | |
| 16 | 14, 15 | jca 521 | . . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1))) → (𝑖 ∈ (ℤ≥‘2) ∧ (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵))) |
| 17 | 16 | ex 418 | . . . 4 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ((𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1)) → (𝑖 ∈ (ℤ≥‘2) ∧ (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵)))) |
| 18 | 7, 17 | impbid2 229 | . . 3 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ((𝑖 ∈ (ℤ≥‘2) ∧ (𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵)) ↔ (𝑖 ∈ ℕ ∧ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1)))) |
| 19 | 18 | rexbidv2 3187 | . 2 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (∃𝑖 ∈ (ℤ≥‘2)(𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ↔ ∃𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1))) |
| 20 | rexanali 3121 | . . 3 ⊢ (∃𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1) ↔ ¬ ∀𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) → 𝑖 = 1)) | |
| 21 | 20 | a1i 11 | . 2 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (∃𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ∧ ¬ 𝑖 = 1) ↔ ¬ ∀𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) → 𝑖 = 1))) |
| 22 | coprmgcdb 16733 | . . 3 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (∀𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) → 𝑖 = 1) ↔ (𝐴 gcd 𝐵) = 1)) | |
| 23 | 22 | necon3bbid 2997 | . 2 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (¬ ∀𝑖 ∈ ℕ ((𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) → 𝑖 = 1) ↔ (𝐴 gcd 𝐵) ≠ 1)) |
| 24 | 19, 21, 23 | 3bitrd 308 | 1 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (∃𝑖 ∈ (ℤ≥‘2)(𝑖 ∥ 𝐴 ∧ 𝑖 ∥ 𝐵) ↔ (𝐴 gcd 𝐵) ≠ 1)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 401 = wceq 1570 ∈ wcel 2146 ≠ wne 2960 ∀wral 3081 ∃wrex 3091 class class class wbr 5111 ‘cfv 6540 (class class class)co 7419 1c1 11120 ℕcn 12252 2c2 12314 ℤ≥cuz 12882 ∥ cdvds 16336 gcd cgcd 16578 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-cnex 11175 ax-resscn 11176 ax-1cn 11177 ax-icn 11178 ax-addcl 11179 ax-addrcl 11180 ax-mulcl 11181 ax-mulrcl 11182 ax-mulcom 11183 ax-addass 11184 ax-mulass 11185 ax-distr 11186 ax-i2m1 11187 ax-1ne0 11188 ax-1rid 11189 ax-rnegex 11190 ax-rrecex 11191 ax-cnre 11192 ax-pre-lttri 11193 ax-pre-lttrn 11194 ax-pre-ltadd 11195 ax-pre-mulgt0 11196 ax-pre-sup 11197 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-rmo 3371 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-tr 5221 df-id 5558 df-eprel 5563 df-po 5571 df-so 5572 df-fr 5616 df-we 5618 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7376 df-ov 7422 df-oprab 7423 df-mpo 7424 df-om 7869 df-2nd 7993 df-frecs 8284 df-wrecs 8315 df-recs 8364 df-rdg 8403 df-er 8700 df-en 8950 df-dom 8951 df-sdom 8952 df-sup 9409 df-inf 9410 df-pnf 11264 df-mnf 11265 df-xr 11266 df-ltxr 11267 df-le 11268 df-sub 11462 df-neg 11463 df-div 11891 df-nn 12253 df-2 12322 df-3 12323 df-n0 12524 df-z 12611 df-uz 12883 df-rp 13037 df-seq 14060 df-exp 14120 df-cj 15178 df-re 15179 df-im 15180 df-sqrt 15314 df-abs 15315 df-dvds 16337 df-gcd 16579 |
| This theorem is used by: ncoprmgcdgt1b 16735 prmdvdsncoprmbd 16812 flt4lem2 43456 |
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