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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 12350 | . . . . 5 ⊢ 1 ∈ ℤ | |
2 | gcddvds 16210 | . . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 1 ∈ ℤ) → ((𝑀 gcd 1) ∥ 𝑀 ∧ (𝑀 gcd 1) ∥ 1)) | |
3 | 1, 2 | mpan2 688 | . . . 4 ⊢ (𝑀 ∈ ℤ → ((𝑀 gcd 1) ∥ 𝑀 ∧ (𝑀 gcd 1) ∥ 1)) |
4 | 3 | simprd 496 | . . 3 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ∥ 1) |
5 | ax-1ne0 10940 | . . . . . . . 8 ⊢ 1 ≠ 0 | |
6 | simpr 485 | . . . . . . . . 9 ⊢ ((𝑀 = 0 ∧ 1 = 0) → 1 = 0) | |
7 | 6 | necon3ai 2968 | . . . . . . . 8 ⊢ (1 ≠ 0 → ¬ (𝑀 = 0 ∧ 1 = 0)) |
8 | 5, 7 | ax-mp 5 | . . . . . . 7 ⊢ ¬ (𝑀 = 0 ∧ 1 = 0) |
9 | gcdn0cl 16209 | . . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 1 ∈ ℤ) ∧ ¬ (𝑀 = 0 ∧ 1 = 0)) → (𝑀 gcd 1) ∈ ℕ) | |
10 | 8, 9 | mpan2 688 | . . . . . 6 ⊢ ((𝑀 ∈ ℤ ∧ 1 ∈ ℤ) → (𝑀 gcd 1) ∈ ℕ) |
11 | 1, 10 | mpan2 688 | . . . . 5 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ∈ ℕ) |
12 | 11 | nnzd 12425 | . . . 4 ⊢ (𝑀 ∈ ℤ → (𝑀 gcd 1) ∈ ℤ) |
13 | 1nn 11984 | . . . 4 ⊢ 1 ∈ ℕ | |
14 | dvdsle 16019 | . . . 4 ⊢ (((𝑀 gcd 1) ∈ ℤ ∧ 1 ∈ ℕ) → ((𝑀 gcd 1) ∥ 1 → (𝑀 gcd 1) ≤ 1)) | |
15 | 12, 13, 14 | sylancl 586 | . . 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 12003 | . . 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 396 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 class class class wbr 5074 (class class class)co 7275 0cc0 10871 1c1 10872 ≤ cle 11010 ℕcn 11973 ℤcz 12319 ∥ 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-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: 1gcd 16241 lcm1 16315 dfphi2 16475 pockthlem 16606 fvprmselgcd1 16746 odinv 19168 pgpfac1lem2 19678 lgs1 26489 lgsquad2lem2 26533 2sqlem11 26577 qqh1 31935 lcmineqlem19 40055 nn0expgcd 40335 |
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