\documentclass[9pt, handout]{beamer}
\usetheme{default}
\usecolortheme{seahorse}

\usepackage[latin1]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}

\date{October 2020}
\author{Alice and Bob \\ ETH Z\"urich}
\title{A talk about elliptic curves}


\begin{document} 


	\begin{frame}
		\titlepage
	\end{frame}	
	
	\begin{frame}
		\frametitle{First slide}
		
		\begin{enumerate}[<+->]
			\item Here comes the first sentence.
			\item And then the second.		
		\end{enumerate}
		
		\begin{lemma}
			Here's a lemma.
		\end{lemma}
		
		
		
		\begin{theorem}
			And this is a theorem.
		\end{theorem}
		
		\begin{corollary}
			And a corollary.
		\end{corollary}
		
	\end{frame}
	

	

	\end{document}