\documentclass{article}
\begin{document}
\[ x >= 0 \]

\[ x <= 0 \]

\[ <x, y> = 0 \]

% Fails to parse, <x,y> is not currently recognized
\[ 0 = <x,y> \]

\[ 2<x,y> = z \]

% Fails to parse, <x,y> is not currently recognized
\[ 0 = <x,y>A \]

% Much less than
\[ a << b \]

% badly written inner product OR badly written sequence of relations?
\[ 0 < <a,b> >1 \]

\end{document}