기여하신 문서�?저작권은 �?기여자에�?있으�? �?기여자는 기여하신 부분의 저작권�?갖습니다. The AMS (American Mathematical Culture) arithmetic package is a robust package that results in a higher layer of abstraction above mathematical LaTeX language; if you use it it will make your daily life easier. Some commands amsmath introduces can make other plain LaTeX https://www.xaphyr.com/fashionlatex