| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > dvdssqf | Structured version Visualization version GIF version | ||
| Description: A divisor of a squarefree number is squarefree. (Contributed by Mario Carneiro, 1-Jul-2015.) |
| Ref | Expression |
|---|---|
| dvdssqf | ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) → ((μ‘𝐴) ≠ 0 → (μ‘𝐵) ≠ 0)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpl3 1195 | . . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → 𝐵 ∥ 𝐴) | |
| 2 | prmz 16607 | . . . . . . . 8 ⊢ (𝑝 ∈ ℙ → 𝑝 ∈ ℤ) | |
| 3 | 2 | adantl 481 | . . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → 𝑝 ∈ ℤ) |
| 4 | zsqcl 14057 | . . . . . . 7 ⊢ (𝑝 ∈ ℤ → (𝑝↑2) ∈ ℤ) | |
| 5 | 3, 4 | syl 17 | . . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → (𝑝↑2) ∈ ℤ) |
| 6 | simpl2 1194 | . . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → 𝐵 ∈ ℕ) | |
| 7 | 6 | nnzd 12519 | . . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → 𝐵 ∈ ℤ) |
| 8 | simpl1 1193 | . . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → 𝐴 ∈ ℕ) | |
| 9 | 8 | nnzd 12519 | . . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → 𝐴 ∈ ℤ) |
| 10 | dvdstr 16226 | . . . . . 6 ⊢ (((𝑝↑2) ∈ ℤ ∧ 𝐵 ∈ ℤ ∧ 𝐴 ∈ ℤ) → (((𝑝↑2) ∥ 𝐵 ∧ 𝐵 ∥ 𝐴) → (𝑝↑2) ∥ 𝐴)) | |
| 11 | 5, 7, 9, 10 | syl3anc 1374 | . . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → (((𝑝↑2) ∥ 𝐵 ∧ 𝐵 ∥ 𝐴) → (𝑝↑2) ∥ 𝐴)) |
| 12 | 1, 11 | mpan2d 695 | . . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) ∧ 𝑝 ∈ ℙ) → ((𝑝↑2) ∥ 𝐵 → (𝑝↑2) ∥ 𝐴)) |
| 13 | 12 | reximdva 3150 | . . 3 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) → (∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐵 → ∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴)) |
| 14 | isnsqf 27106 | . . . 4 ⊢ (𝐵 ∈ ℕ → ((μ‘𝐵) = 0 ↔ ∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐵)) | |
| 15 | 14 | 3ad2ant2 1135 | . . 3 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) → ((μ‘𝐵) = 0 ↔ ∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐵)) |
| 16 | isnsqf 27106 | . . . 4 ⊢ (𝐴 ∈ ℕ → ((μ‘𝐴) = 0 ↔ ∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴)) | |
| 17 | 16 | 3ad2ant1 1134 | . . 3 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) → ((μ‘𝐴) = 0 ↔ ∃𝑝 ∈ ℙ (𝑝↑2) ∥ 𝐴)) |
| 18 | 13, 15, 17 | 3imtr4d 294 | . 2 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) → ((μ‘𝐵) = 0 → (μ‘𝐴) = 0)) |
| 19 | 18 | necon3d 2954 | 1 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐵 ∥ 𝐴) → ((μ‘𝐴) ≠ 0 → (μ‘𝐵) ≠ 0)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1087 = wceq 1542 ∈ wcel 2114 ≠ wne 2933 ∃wrex 3061 class class class wbr 5099 ‘cfv 6493 (class class class)co 7361 0cc0 11031 ℕcn 12150 2c2 12205 ℤcz 12493 ↑cexp 13989 ∥ cdvds 16184 ℙcprime 16603 μcmu 27066 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5242 ax-nul 5252 ax-pow 5311 ax-pr 5378 ax-un 7683 ax-cnex 11087 ax-resscn 11088 ax-1cn 11089 ax-icn 11090 ax-addcl 11091 ax-addrcl 11092 ax-mulcl 11093 ax-mulrcl 11094 ax-mulcom 11095 ax-addass 11096 ax-mulass 11097 ax-distr 11098 ax-i2m1 11099 ax-1ne0 11100 ax-1rid 11101 ax-rnegex 11102 ax-rrecex 11103 ax-cnre 11104 ax-pre-lttri 11105 ax-pre-lttrn 11106 ax-pre-ltadd 11107 ax-pre-mulgt0 11108 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3062 df-rmo 3351 df-reu 3352 df-rab 3401 df-v 3443 df-sbc 3742 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4287 df-if 4481 df-pw 4557 df-sn 4582 df-pr 4584 df-op 4588 df-uni 4865 df-int 4904 df-iun 4949 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6260 df-ord 6321 df-on 6322 df-lim 6323 df-suc 6324 df-iota 6449 df-fun 6495 df-fn 6496 df-f 6497 df-f1 6498 df-fo 6499 df-f1o 6500 df-fv 6501 df-riota 7318 df-ov 7364 df-oprab 7365 df-mpo 7366 df-om 7812 df-1st 7936 df-2nd 7937 df-frecs 8226 df-wrecs 8257 df-recs 8306 df-rdg 8344 df-1o 8400 df-er 8638 df-en 8889 df-dom 8890 df-sdom 8891 df-fin 8892 df-card 9856 df-pnf 11173 df-mnf 11174 df-xr 11175 df-ltxr 11176 df-le 11177 df-sub 11371 df-neg 11372 df-div 11800 df-nn 12151 df-2 12213 df-n0 12407 df-z 12494 df-uz 12757 df-fz 13429 df-seq 13930 df-exp 13990 df-hash 14259 df-dvds 16185 df-prm 16604 df-mu 27072 |
| This theorem is referenced by: (None) |
| Copyright terms: Public domain | W3C validator |