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Mirrors > Home > MPE Home > Th. List > dvdssqlem | Structured version Visualization version GIF version |
Description: Lemma for dvdssq 16272. (Contributed by Scott Fenton, 18-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.) |
Ref | Expression |
---|---|
dvdssqlem | ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ∥ 𝑁 ↔ (𝑀↑2) ∥ (𝑁↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnz 12342 | . . 3 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℤ) | |
2 | nnz 12342 | . . 3 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) | |
3 | dvdssqim 16264 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 → (𝑀↑2) ∥ (𝑁↑2))) | |
4 | 1, 2, 3 | syl2an 596 | . 2 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ∥ 𝑁 → (𝑀↑2) ∥ (𝑁↑2))) |
5 | sqgcd 16270 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 gcd 𝑁)↑2) = ((𝑀↑2) gcd (𝑁↑2))) | |
6 | 5 | adantr 481 | . . . . . 6 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀 gcd 𝑁)↑2) = ((𝑀↑2) gcd (𝑁↑2))) |
7 | nnsqcl 13847 | . . . . . . . 8 ⊢ (𝑀 ∈ ℕ → (𝑀↑2) ∈ ℕ) | |
8 | nnsqcl 13847 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ → (𝑁↑2) ∈ ℕ) | |
9 | gcdeq 16263 | . . . . . . . 8 ⊢ (((𝑀↑2) ∈ ℕ ∧ (𝑁↑2) ∈ ℕ) → (((𝑀↑2) gcd (𝑁↑2)) = (𝑀↑2) ↔ (𝑀↑2) ∥ (𝑁↑2))) | |
10 | 7, 8, 9 | syl2an 596 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (((𝑀↑2) gcd (𝑁↑2)) = (𝑀↑2) ↔ (𝑀↑2) ∥ (𝑁↑2))) |
11 | 10 | biimpar 478 | . . . . . 6 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀↑2) gcd (𝑁↑2)) = (𝑀↑2)) |
12 | 6, 11 | eqtrd 2778 | . . . . 5 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀 gcd 𝑁)↑2) = (𝑀↑2)) |
13 | gcdcl 16213 | . . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 gcd 𝑁) ∈ ℕ0) | |
14 | 1, 2, 13 | syl2an 596 | . . . . . . . 8 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 gcd 𝑁) ∈ ℕ0) |
15 | 14 | nn0red 12294 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 gcd 𝑁) ∈ ℝ) |
16 | 14 | nn0ge0d 12296 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 0 ≤ (𝑀 gcd 𝑁)) |
17 | nnre 11980 | . . . . . . . 8 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℝ) | |
18 | 17 | adantr 481 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 𝑀 ∈ ℝ) |
19 | nnnn0 12240 | . . . . . . . . 9 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℕ0) | |
20 | 19 | nn0ge0d 12296 | . . . . . . . 8 ⊢ (𝑀 ∈ ℕ → 0 ≤ 𝑀) |
21 | 20 | adantr 481 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 0 ≤ 𝑀) |
22 | sq11 13850 | . . . . . . 7 ⊢ ((((𝑀 gcd 𝑁) ∈ ℝ ∧ 0 ≤ (𝑀 gcd 𝑁)) ∧ (𝑀 ∈ ℝ ∧ 0 ≤ 𝑀)) → (((𝑀 gcd 𝑁)↑2) = (𝑀↑2) ↔ (𝑀 gcd 𝑁) = 𝑀)) | |
23 | 15, 16, 18, 21, 22 | syl22anc 836 | . . . . . 6 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (((𝑀 gcd 𝑁)↑2) = (𝑀↑2) ↔ (𝑀 gcd 𝑁) = 𝑀)) |
24 | 23 | adantr 481 | . . . . 5 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → (((𝑀 gcd 𝑁)↑2) = (𝑀↑2) ↔ (𝑀 gcd 𝑁) = 𝑀)) |
25 | 12, 24 | mpbid 231 | . . . 4 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → (𝑀 gcd 𝑁) = 𝑀) |
26 | gcddvds 16210 | . . . . . . 7 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)) | |
27 | 1, 2, 26 | syl2an 596 | . . . . . 6 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)) |
28 | 27 | adantr 481 | . . . . 5 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)) |
29 | 28 | simprd 496 | . . . 4 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → (𝑀 gcd 𝑁) ∥ 𝑁) |
30 | 25, 29 | eqbrtrrd 5098 | . . 3 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → 𝑀 ∥ 𝑁) |
31 | 30 | ex 413 | . 2 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀↑2) ∥ (𝑁↑2) → 𝑀 ∥ 𝑁)) |
32 | 4, 31 | impbid 211 | 1 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ∥ 𝑁 ↔ (𝑀↑2) ∥ (𝑁↑2))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1539 ∈ wcel 2106 class class class wbr 5074 (class class class)co 7275 ℝcr 10870 0cc0 10871 ≤ cle 11010 ℕcn 11973 2c2 12028 ℕ0cn0 12233 ℤcz 12319 ↑cexp 13782 ∥ cdvds 15963 gcd cgcd 16201 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947 ax-pre-mulgt0 10948 ax-pre-sup 10949 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-rmo 3071 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-pss 3906 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-tr 5192 df-id 5489 df-eprel 5495 df-po 5503 df-so 5504 df-fr 5544 df-we 5546 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-pred 6202 df-ord 6269 df-on 6270 df-lim 6271 df-suc 6272 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-om 7713 df-2nd 7832 df-frecs 8097 df-wrecs 8128 df-recs 8202 df-rdg 8241 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-sup 9201 df-inf 9202 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-div 11633 df-nn 11974 df-2 12036 df-3 12037 df-n0 12234 df-z 12320 df-uz 12583 df-rp 12731 df-fl 13512 df-mod 13590 df-seq 13722 df-exp 13783 df-cj 14810 df-re 14811 df-im 14812 df-sqrt 14946 df-abs 14947 df-dvds 15964 df-gcd 16202 |
This theorem is referenced by: dvdssq 16272 muval1 26282 fltabcoprm 40479 |
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