\Chi - LaTeX Symbol

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X

\Chi

The Greek letter Chi (\Chi) is used in various scientific and mathematical contexts. It is often used to denote a characteristic function in probability theory, a chromatic number in graph theory, or a variable in statistical distributions.

Examples

X^{2}

Chi-squared distribution, commonly used in statistical tests.

\Chi^2

X (G)

Chromatic number of a graph G, representing the minimum number of colors needed to color the graph.

\Chi(G)

X_{A} (x) = {1, 0, if x \in A if x \in / A

Characteristic function of a set A, indicating membership of an element x in A.

\Chi_A(x) = \begin{cases} 1, & \text{if } x \in A \\ 0, & \text{if } x \notin A \end{cases}