#the below is what I directly posted to oBsidian and when it didn't work (please see end) I created a document and pasted it

$$
\begin{tabular}{c|c|c|}
\hline Matrix & Eigenvalues & Eigenvectors \\
\hline A & $\lambda_{1}, \lambda_{2}, \lambda_{3} \ldots \ldots \lambda_{n}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
$k A$ & $k \lambda_{1}, k \lambda_{2}, k \lambda_{3} \ldots \ldots k \lambda_{n}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
\hline$A^{m}$ & $\lambda_{1}^{m}, \lambda_{2}^{m}, \lambda_{3}^{m}, \ldots \ldots \lambda_{n}^{m}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
$A^{-1}$ & $1 / \lambda_{1}, 1 / \lambda_{2}, 1 / \lambda_{3} \ldots \ldots 1 / \lambda_{n}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
\hline$(A)$ & $f(\lambda)$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
\hline
\end{tabular}
$$

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$$
\documentclass[10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[version=4]{mhchem}
\usepackage{stmaryrd}

\title{Properties of Eigenvalues \& Eigenvectors }

\author{}
\date{}


\begin{document}
\maketitle
$G \cdot M \cdot(n-\Upsilon)$

\section*{(1) Sum of the eigenvalues $=$ Trace of the matrix}
\section*{(2) Product of the eigenvalues $=$ Determinant of the matrix}
(3) For real matrices, complex eigenvalues occur in complex conjugate pairs.

\begin{center}
\begin{tabular}{c|c|c|}
\hline
Matrix & Eigenvalues & Eigenvectors \\
\hline
A & $\lambda_{1}, \lambda_{2}, \lambda_{3} \ldots \ldots \lambda_{n}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
$k A$ & $k \lambda_{1}, k \lambda_{2}, k \lambda_{3} \ldots \ldots k \lambda_{n}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
\hline
$A^{m}$ & $\lambda_{1}^{m}, \lambda_{2}^{m}, \lambda_{3}^{m}, \ldots \ldots \lambda_{n}^{m}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
$A^{-1}$ & $1 / \lambda_{1}, 1 / \lambda_{2}, 1 / \lambda_{3} \ldots \ldots 1 / \lambda_{n}$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
\hline
$(A)$ & $f(\lambda)$ & $X_{1}, X_{2}, X_{3} \ldots \ldots X_{n}$ \\
\hline
\end{tabular}
\end{center}


\end{document}
$$

and it still didn't work.