November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
44
유한체 연산을 정의할 때 나머지연산을 사용하겠습니다. 유한체에서 대부분의 연산은 어느 정
도 나머지 연산자를 통해서 이루어집니다.
1.4.1
파이썬으로 나머지연산 코딩하기
파이썬에서 나머지연산은
%
연산자를 사용합니다. 아래는 사용례입니다.
>>> print(7 % 3)
1
음수에 대해서도 아래처럼 사용할 수 있습니다.
>>> print(-27 % 13)
12
1.5
유한체 덧셈과 뺄셈
유한체에서의 덧셈을 정의할 때 그 결과가 여전히 유한체에 속해 있도록 해야 합니다. 즉 수학
용어로 유한체에서 덧셈이 닫혀 있도록 해야 합니다.
방금 배운 나머지연산으로 덧셈을 정의하면 유한체에서 덧셈이 닫혀 있도록 할 수 있습니다.
다음과 같이
19
를 위수로하는 유한체가 있다고 합시다.
F
19
=
{0
,
1
,
2
, ...
18}
여기에서
a
,
b
∈
F
19
이고 기호 ∈는 왼쪽의 원소가 오른쪽 집합에 속해 있다는 뜻입니다.
a
,
b
는
F
19
의 원소입니다.
덧셈에 대해 닫혀 있다는 뜻은 다음과 같습니다.
a
+
f
b
∈
F
19
1
장
유한체
45
여기서는 일반 정수에서의 덧셈과 구별하기
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.