Strict inequalities are widely used in math equations as well as within text for comparisons. They can be produced using the ordinary (inline) math-mode (
$...$) without loading a specific package.
$c > d$
$d < c$
In order to omit the math-mode within a text-paragraph, LaTeX knows text-mode commands for these symbols.
Greater than (>):
Less than (<):
Non-strict inequalities ( and ), however, can only be produced using the inline math mode.
$a \le b$
$b \ge a$
Finally, the equal symbol (=) is available in both text- and math-mode.