■剰余系(その14)
120=2^3・3・5の約数は自然数を覆う剰余系を構成する。
x=ai mod(ni)
(ai,ni)
n1<n2<・・・、ここではn1=3とする
===================================
12,15,20,24,30,40,60,120
{02,08}
{16}
{22,26,28}
{32,38}
{46}
{52,56,58}
{62,68}
{76}
{82,86,88}
{92,98}
{106}
{112,116,118} どちらも同じになった
===================================
12,15,20,24,30,40,60,120
{02,08}
{16}
{22,26,28}
{32,38}
{46}
{52,56,58}
{62,68}
{76}
{82,86,88}
{92,98}
{106}
{112,116,118} どちらも同じになった
===================================
20で割って2余る数を消すと
{08}
{16}
{26,28}
{32,38}
{46}
{52,56,58}
{68}
{76}
{86,88}
{92,98}
{106}
{112,116,118}
===================================
30で割って8余る数を消すと
{}
{16}
{26,28}
{32}
{46}
{52,56,58}
{}
{76}
{86,88}
{92}
{106}
{112,116,118}
===================================
40で割って16余る数を消すと
{}
{}
{26,28}
{32}
{46}
{52,58}
{}
{76}
{86,88}
{92}
{106}
{112,116,118}
===================================
60で割って26余る数を消すと
{}
{}
{28}
{32}
{46}
{52,58}
{}
{76}
{88}
{92}
{106}
{112,116,118}
===================================
15,24,120だけでは消すのは難しい・・・
15で割って13余る数を消す
{}
{}
{}
{32}
{46}
{52}
{}
{76}
{}
{92}
{106}
{112,116}
===================================