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The following is the code I am running and I would like to make spaces before a new section starts and space before I write the next line after making section a little bigger. Also is there a way to increse space between theorems, lemmas, corrolaries etc also by just a little.

\documentclass[12pt,a4paper]{amsart}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{amscd}
\usepackage[latin2]{inputenc}
\usepackage{t1enc}
\usepackage[mathscr]{eucal}
\usepackage{indentfirst}
\usepackage{graphicx}
\usepackage{graphics}
\usepackage{pict2e}
\usepackage{epic}
\numberwithin{equation}{section}
\usepackage[margin=2.9cm]{geometry}
\usepackage{epstopdf} 
\def\numset#1{{\\mathbb #1}}
\theoremstyle{plain}
\newtheorem{Th}{Theorem}[section]
\newtheorem{Lemma}[Th]{Lemma}
\newtheorem{Cor}[Th]{Corollary}
\newtheorem{Prop}[Th]{Proposition}
\theoremstyle{definition}
\newtheorem{Def}[Th]{Definition}
\newtheorem{Conj}[Th]{Conjecture}
\newtheorem{Rem}[Th]{Remark}
\newtheorem{?}[Th]{Problem}
\newtheorem{Ex}[Th]{Example}
\newcommand{\im}{\operatorname{im}}
\newcommand{\Hom}{{\rm{Hom}}}
\newcommand{\diam}{{\rm{diam}}}
\newcommand{\ovl}{\overline}
%\newcommand{\M}{\mathbb{M}}
\begin{document}
\title{lipsum}
\author{John Cena}
\begin{abstract} Abstract
\end{abstract}
\maketitle
\section{Introduction} In this section
\end{document}
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    Please extend your MWE with some dummy text and an example of theorems.
    – Zarko
    Aug 4, 2019 at 13:28
  • Please also clarify what you have in mind for the term "by just a little".
    – Mico
    Aug 4, 2019 at 13:38
  • Off-topic: Any reason for using latin2 rather than utf8 as the input encoding option? Aside: \usepackage{t1enc} is deprecated; use \usepackage[T1]{fontenc} instead. Still another aside: It's pointless to load both graphicx and graphics; if this were my document, I'd load only graphicx. A third aside: loading the epstopdf package should only be necessary if your TeX distribution is at least six years old and hasn't been updated since.
    – Mico
    Aug 4, 2019 at 13:50
  • And, while you're at it fixing up the preamble of your document, you really ought to replace \newcommand{\Hom}{{\rm{Hom}}} with \DeclareMathOperator{\Hom}{Hom} and replace \newcommand{\diam}{{\rm{diam}}} with \DeclareMathOperator{\diam}{diam}.
    – Mico
    Aug 4, 2019 at 13:57
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