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How to write latex symbol not equal : \neq
Not equal symbol in Latex is the command: \neq
$x \neq y$
which gives:
$x \neq y$
Here are few examples:
$A \neq B$
$A \neq B$
$\{x_1\} \neq \{x_1,x_2\}$
$\{x_1\} \neq \{x_1,x_2\}$