# Bold text and newlines inside equations.

What I'm doing:

\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{eucal}
\usepackage{amssymb}
\usepackage{mathrsfs}

% don't know what some of those do, but i think all the math related ones are
% there
% there are more packages being imported though


Then I try:

\textbf{w_{n+1}} = \textbf{w_{n}} + e\eta\textbf{x}(n) \\
\textbf{\Delta}\textbf{w} = e\eta\textbf{x}

-