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The LaTeX command for Lambda (Λ) is \Lambda. The lowercase form λ is \lambda.
\LambdaWrite \Lambda 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.
$\Lambda(x) = \Lambda_0$Prefer to see it live? Paste it into the LaTeX preview and it renders as you type: no compiler, no signup.
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Use \Lambda in math mode; it needs no extra package. For example, $\Lambda(x) = \Lambda_0$.
None: \Lambda is built into LaTeX, so no extra package is required.