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Mirrors > Home > MPE Home > Th. List > Mathboxes > gcd2odd1 | Structured version Visualization version GIF version |
Description: The greatest common divisor of an odd number and 2 is 1, i.e., 2 and any odd number are coprime. Remark: The proof using dfodd7 43902 is longer (see proof in comment)! (Contributed by AV, 5-Jun-2023.) |
Ref | Expression |
---|---|
gcd2odd1 | ⊢ (𝑍 ∈ Odd → (𝑍 gcd 2) = 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oddz 43866 | . . 3 ⊢ (𝑍 ∈ Odd → 𝑍 ∈ ℤ) | |
2 | 2z 12008 | . . 3 ⊢ 2 ∈ ℤ | |
3 | gcdcom 15855 | . . 3 ⊢ ((𝑍 ∈ ℤ ∧ 2 ∈ ℤ) → (𝑍 gcd 2) = (2 gcd 𝑍)) | |
4 | 1, 2, 3 | sylancl 588 | . 2 ⊢ (𝑍 ∈ Odd → (𝑍 gcd 2) = (2 gcd 𝑍)) |
5 | 2ndvdsodd 43890 | . . 3 ⊢ (𝑍 ∈ Odd → ¬ 2 ∥ 𝑍) | |
6 | 2prm 16029 | . . . 4 ⊢ 2 ∈ ℙ | |
7 | coprm 16048 | . . . 4 ⊢ ((2 ∈ ℙ ∧ 𝑍 ∈ ℤ) → (¬ 2 ∥ 𝑍 ↔ (2 gcd 𝑍) = 1)) | |
8 | 6, 1, 7 | sylancr 589 | . . 3 ⊢ (𝑍 ∈ Odd → (¬ 2 ∥ 𝑍 ↔ (2 gcd 𝑍) = 1)) |
9 | 5, 8 | mpbid 234 | . 2 ⊢ (𝑍 ∈ Odd → (2 gcd 𝑍) = 1) |
10 | 4, 9 | eqtrd 2855 | 1 ⊢ (𝑍 ∈ Odd → (𝑍 gcd 2) = 1) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 = wceq 1536 ∈ wcel 2113 class class class wbr 5059 (class class class)co 7149 1c1 10531 2c2 11686 ℤcz 11975 ∥ cdvds 15600 gcd cgcd 15836 ℙcprime 16008 Odd codd 43860 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5323 ax-un 7454 ax-cnex 10586 ax-resscn 10587 ax-1cn 10588 ax-icn 10589 ax-addcl 10590 ax-addrcl 10591 ax-mulcl 10592 ax-mulrcl 10593 ax-mulcom 10594 ax-addass 10595 ax-mulass 10596 ax-distr 10597 ax-i2m1 10598 ax-1ne0 10599 ax-1rid 10600 ax-rnegex 10601 ax-rrecex 10602 ax-cnre 10603 ax-pre-lttri 10604 ax-pre-lttrn 10605 ax-pre-ltadd 10606 ax-pre-mulgt0 10607 ax-pre-sup 10608 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1083 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-nel 3123 df-ral 3142 df-rex 3143 df-reu 3144 df-rmo 3145 df-rab 3146 df-v 3493 df-sbc 3769 df-csb 3877 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-pss 3947 df-nul 4285 df-if 4461 df-pw 4534 df-sn 4561 df-pr 4563 df-tp 4565 df-op 4567 df-uni 4832 df-iun 4914 df-br 5060 df-opab 5122 df-mpt 5140 df-tr 5166 df-id 5453 df-eprel 5458 df-po 5467 df-so 5468 df-fr 5507 df-we 5509 df-xp 5554 df-rel 5555 df-cnv 5556 df-co 5557 df-dm 5558 df-rn 5559 df-res 5560 df-ima 5561 df-pred 6141 df-ord 6187 df-on 6188 df-lim 6189 df-suc 6190 df-iota 6307 df-fun 6350 df-fn 6351 df-f 6352 df-f1 6353 df-fo 6354 df-f1o 6355 df-fv 6356 df-riota 7107 df-ov 7152 df-oprab 7153 df-mpo 7154 df-om 7574 df-1st 7682 df-2nd 7683 df-wrecs 7940 df-recs 8001 df-rdg 8039 df-1o 8095 df-2o 8096 df-er 8282 df-en 8503 df-dom 8504 df-sdom 8505 df-fin 8506 df-sup 8899 df-inf 8900 df-pnf 10670 df-mnf 10671 df-xr 10672 df-ltxr 10673 df-le 10674 df-sub 10865 df-neg 10866 df-div 11291 df-nn 11632 df-2 11694 df-3 11695 df-n0 11892 df-z 11976 df-uz 12238 df-rp 12384 df-fz 12890 df-seq 13367 df-exp 13427 df-cj 14451 df-re 14452 df-im 14453 df-sqrt 14587 df-abs 14588 df-dvds 15601 df-gcd 15837 df-prm 16009 df-odd 43862 |
This theorem is referenced by: fpprel2 43976 |
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