The LaTeX command for gt (>) is >.
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Write > inside math mode, that is between $…$ for inline math or in a \[ … \] or equation block for display math. It is part of core LaTeX math, so no extra package is required.
As a relation, > gets a thick space on each side, and a long inline formula may break after it. With unicode-math under XeLaTeX or LuaLaTeX, typing > in a formula gives the same symbol.
$a > b$Open this example in the live preview: it renders as you type, with no compiler and no signup.
Relation symbols in LaTeX: the full table or search all 350+ LaTeX symbols.
Use > in math mode; it needs no extra package. For example, $a > b$.
None: > is built into LaTeX, so no extra package is required.