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Mirrors > Home > MPE Home > Th. List > gcd1 | Structured version Visualization version GIF version |
Description: The gcd of a number with 1 is 1. Theorem 1.4(d)1 in [ApostolNT] p. 16. (Contributed by Mario Carneiro, 19-Feb-2014.) |
Ref | Expression |
---|---|
gcd1 | ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1z 12280 | . . . . 5 ⊢ 1 ∈ ℤ | |
2 | gcddvds 16138 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 1 ∈ ℤ) → ((𝑀 gcd 1) ∥ 𝑀 ∧ (𝑀 gcd 1) ∥ 1)) | |
3 | 1, 2 | mpan2 687 | . . . 4 ⊢ (𝑀 ∈ ℤ → ((𝑀 gcd 1) ∥ 𝑀 ∧ (𝑀 gcd 1) ∥ 1)) |
4 | 3 | simprd 495 | . . 3 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ∥ 1) |
5 | ax-1ne0 10871 | . . . . . . . 8 ⊢ 1 ≠ 0 | |
6 | simpr 484 | . . . . . . . . 9 ⊢ ((𝑀 = 0 ∧ 1 = 0) → 1 = 0) | |
7 | 6 | necon3ai 2967 | . . . . . . . 8 ⊢ (1 ≠ 0 → ¬ (𝑀 = 0 ∧ 1 = 0)) |
8 | 5, 7 | ax-mp 5 | . . . . . . 7 ⊢ ¬ (𝑀 = 0 ∧ 1 = 0) |
9 | gcdn0cl 16137 | . . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 1 ∈ ℤ) ∧ ¬ (𝑀 = 0 ∧ 1 = 0)) → (𝑀 gcd 1) ∈ ℕ) | |
10 | 8, 9 | mpan2 687 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 1 ∈ ℤ) → (𝑀 gcd 1) ∈ ℕ) |
11 | 1, 10 | mpan2 687 | . . . . 5 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ∈ ℕ) |
12 | 11 | nnzd 12354 | . . . 4 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ∈ ℤ) |
13 | 1nn 11914 | . . . 4 ⊢ 1 ∈ ℕ | |
14 | dvdsle 15947 | . . . 4 ⊢ (((𝑀 gcd 1) ∈ ℤ ∧ 1 ∈ ℕ) → ((𝑀 gcd 1) ∥ 1 → (𝑀 gcd 1) ≤ 1)) | |
15 | 12, 13, 14 | sylancl 585 | . . 3 ⊢ (𝑀 ∈ ℤ → ((𝑀 gcd 1) ∥ 1 → (𝑀 gcd 1) ≤ 1)) |
16 | 4, 15 | mpd 15 | . 2 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ≤ 1) |
17 | nnle1eq1 11933 | . . 3 ⊢ ((𝑀 gcd 1) ∈ ℕ → ((𝑀 gcd 1) ≤ 1 ↔ (𝑀 gcd 1) = 1)) | |
18 | 11, 17 | syl 17 | . 2 ⊢ (𝑀 ∈ ℤ → ((𝑀 gcd 1) ≤ 1 ↔ (𝑀 gcd 1) = 1)) |
19 | 16, 18 | mpbid 231 | 1 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) = 1) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 class class class wbr 5070 (class class class)co 7255 0cc0 10802 1c1 10803 ≤ cle 10941 ℕcn 11903 ℤcz 12249 ∥ cdvds 15891 gcd cgcd 16129 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-sup 9131 df-inf 9132 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-n0 12164 df-z 12250 df-uz 12512 df-rp 12660 df-seq 13650 df-exp 13711 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-dvds 15892 df-gcd 16130 |
This theorem is referenced by: 1gcd 16169 lcm1 16243 dfphi2 16403 pockthlem 16534 fvprmselgcd1 16674 odinv 19083 pgpfac1lem2 19593 lgs1 26394 lgsquad2lem2 26438 2sqlem11 26482 qqh1 31835 lcmineqlem19 39983 nn0expgcd 40256 |
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