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The LaTeX command for Longrightarrow (⟹) is \Longrightarrow.
\LongrightarrowWrite \Longrightarrow 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.
$A \Longrightarrow B$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type: no compiler, no signup.
\to\leftarrow\rightarrow\leftrightarrow\Leftarrow\Rightarrow\Leftrightarrow\iff\implies\uparrow\downarrow\updownarrow\nearrow\searrowSearch all 380+ LaTeX symbols →
Use \Longrightarrow in math mode; it needs no extra package. For example, $A \Longrightarrow B$.
None: \Longrightarrow is built into LaTeX, so no extra package is required.