\newcommand{\doublespace} {\addtolength{\baselineskip}{.4\baselineskip}}
% Spacing for the whole document
\newcommand{\currentspace}{\doubleespace}
\documentclass[amssymb,12pt]{article}
\usepackage{amscd, amssymb, amsfonts}
\usepackage{graphicx}
\usepackage{amsmath,amsthm}
\usepackage{amssymb}
\setlength{\textheight}{7.6 true in} \setlength{\textwidth}{5.6
true in}
\newtheorem{theorem}{Theorem}[section]
\newtheorem{lemma}[theorem]{Lemma}
\newtheorem{proposition}[theorem]{Proposition}
\newtheorem{corollary}[theorem]{Corollary}
\theoremstyle{definition}
\newtheorem{definition}[theorem]{Definition}
\newtheorem{example}[theorem]{Example}
\newtheorem{xca}[theorem]{Exercise}
\theoremstyle{remark}
\newtheorem{remark}[theorem]{Remark}
\newcommand{\valp}[1]{\nu_p\left(#1\right)}
\newcommand{\ssum}{\sideset{}{^{\textstyle *}}\sum}
\numberwithin{equation}{section}
\newcommand{\abs}[1]{\lvert#1\rvert}
\newcommand{\blankbox}[2]{}
\def\baselinestretch{1.8}
%\numberwithin{equation}{section}
\renewcommand{\theequation}{\arabic{section}.\arabic{equation}}
\begin{document}
\title{Convolution Sums of Divisor Functions}
\author{Jeong}
\date{}
KTUG 한국 텍 사용자 그룹