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Mirrors > Home > ILE Home > Th. List > dvdssqlem | GIF version |
Description: Lemma for dvdssq 11964. (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 9210 | . . 3 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℤ) | |
2 | nnz 9210 | . . 3 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℤ) | |
3 | dvdssqim 11957 | . . 3 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ∥ 𝑁 → (𝑀↑2) ∥ (𝑁↑2))) | |
4 | 1, 2, 3 | syl2an 287 | . 2 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ∥ 𝑁 → (𝑀↑2) ∥ (𝑁↑2))) |
5 | sqgcd 11962 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 gcd 𝑁)↑2) = ((𝑀↑2) gcd (𝑁↑2))) | |
6 | 5 | adantr 274 | . . . . . 6 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀 gcd 𝑁)↑2) = ((𝑀↑2) gcd (𝑁↑2))) |
7 | nnsqcl 10524 | . . . . . . . 8 ⊢ (𝑀 ∈ ℕ → (𝑀↑2) ∈ ℕ) | |
8 | nnsqcl 10524 | . . . . . . . 8 ⊢ (𝑁 ∈ ℕ → (𝑁↑2) ∈ ℕ) | |
9 | gcdeq 11956 | . . . . . . . 8 ⊢ (((𝑀↑2) ∈ ℕ ∧ (𝑁↑2) ∈ ℕ) → (((𝑀↑2) gcd (𝑁↑2)) = (𝑀↑2) ↔ (𝑀↑2) ∥ (𝑁↑2))) | |
10 | 7, 8, 9 | syl2an 287 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (((𝑀↑2) gcd (𝑁↑2)) = (𝑀↑2) ↔ (𝑀↑2) ∥ (𝑁↑2))) |
11 | 10 | biimpar 295 | . . . . . 6 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀↑2) gcd (𝑁↑2)) = (𝑀↑2)) |
12 | 6, 11 | eqtrd 2198 | . . . . 5 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀 gcd 𝑁)↑2) = (𝑀↑2)) |
13 | gcdcl 11899 | . . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 gcd 𝑁) ∈ ℕ0) | |
14 | 1, 2, 13 | syl2an 287 | . . . . . . . 8 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 gcd 𝑁) ∈ ℕ0) |
15 | 14 | nn0red 9168 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 gcd 𝑁) ∈ ℝ) |
16 | 14 | nn0ge0d 9170 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 0 ≤ (𝑀 gcd 𝑁)) |
17 | nnre 8864 | . . . . . . . 8 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℝ) | |
18 | 17 | adantr 274 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 𝑀 ∈ ℝ) |
19 | nnnn0 9121 | . . . . . . . . 9 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℕ0) | |
20 | 19 | nn0ge0d 9170 | . . . . . . . 8 ⊢ (𝑀 ∈ ℕ → 0 ≤ 𝑀) |
21 | 20 | adantr 274 | . . . . . . 7 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → 0 ≤ 𝑀) |
22 | sq11 10527 | . . . . . . 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 1229 | . . . . . 6 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (((𝑀 gcd 𝑁)↑2) = (𝑀↑2) ↔ (𝑀 gcd 𝑁) = 𝑀)) |
24 | 23 | adantr 274 | . . . . 5 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → (((𝑀 gcd 𝑁)↑2) = (𝑀↑2) ↔ (𝑀 gcd 𝑁) = 𝑀)) |
25 | 12, 24 | mpbid 146 | . . . 4 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → (𝑀 gcd 𝑁) = 𝑀) |
26 | gcddvds 11896 | . . . . . . 7 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)) | |
27 | 1, 2, 26 | syl2an 287 | . . . . . 6 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)) |
28 | 27 | adantr 274 | . . . . 5 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)) |
29 | 28 | simprd 113 | . . . 4 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → (𝑀 gcd 𝑁) ∥ 𝑁) |
30 | 25, 29 | eqbrtrrd 4006 | . . 3 ⊢ (((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) ∧ (𝑀↑2) ∥ (𝑁↑2)) → 𝑀 ∥ 𝑁) |
31 | 30 | ex 114 | . 2 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → ((𝑀↑2) ∥ (𝑁↑2) → 𝑀 ∥ 𝑁)) |
32 | 4, 31 | impbid 128 | 1 ⊢ ((𝑀 ∈ ℕ ∧ 𝑁 ∈ ℕ) → (𝑀 ∥ 𝑁 ↔ (𝑀↑2) ∥ (𝑁↑2))) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1343 ∈ wcel 2136 class class class wbr 3982 (class class class)co 5842 ℝcr 7752 0cc0 7753 ≤ cle 7934 ℕcn 8857 2c2 8908 ℕ0cn0 9114 ℤcz 9191 ↑cexp 10454 ∥ cdvds 11727 gcd cgcd 11875 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-coll 4097 ax-sep 4100 ax-nul 4108 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-iinf 4565 ax-cnex 7844 ax-resscn 7845 ax-1cn 7846 ax-1re 7847 ax-icn 7848 ax-addcl 7849 ax-addrcl 7850 ax-mulcl 7851 ax-mulrcl 7852 ax-addcom 7853 ax-mulcom 7854 ax-addass 7855 ax-mulass 7856 ax-distr 7857 ax-i2m1 7858 ax-0lt1 7859 ax-1rid 7860 ax-0id 7861 ax-rnegex 7862 ax-precex 7863 ax-cnre 7864 ax-pre-ltirr 7865 ax-pre-ltwlin 7866 ax-pre-lttrn 7867 ax-pre-apti 7868 ax-pre-ltadd 7869 ax-pre-mulgt0 7870 ax-pre-mulext 7871 ax-arch 7872 ax-caucvg 7873 |
This theorem depends on definitions: df-bi 116 df-stab 821 df-dc 825 df-3or 969 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-reu 2451 df-rmo 2452 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-nul 3410 df-if 3521 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-int 3825 df-iun 3868 df-br 3983 df-opab 4044 df-mpt 4045 df-tr 4081 df-id 4271 df-po 4274 df-iso 4275 df-iord 4344 df-on 4346 df-ilim 4347 df-suc 4349 df-iom 4568 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-f1 5193 df-fo 5194 df-f1o 5195 df-fv 5196 df-riota 5798 df-ov 5845 df-oprab 5846 df-mpo 5847 df-1st 6108 df-2nd 6109 df-recs 6273 df-frec 6359 df-sup 6949 df-pnf 7935 df-mnf 7936 df-xr 7937 df-ltxr 7938 df-le 7939 df-sub 8071 df-neg 8072 df-reap 8473 df-ap 8480 df-div 8569 df-inn 8858 df-2 8916 df-3 8917 df-4 8918 df-n0 9115 df-z 9192 df-uz 9467 df-q 9558 df-rp 9590 df-fz 9945 df-fzo 10078 df-fl 10205 df-mod 10258 df-seqfrec 10381 df-exp 10455 df-cj 10784 df-re 10785 df-im 10786 df-rsqrt 10940 df-abs 10941 df-dvds 11728 df-gcd 11876 |
This theorem is referenced by: dvdssq 11964 |
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