Getting the error “Missing $ inserted” in LaTeX

The “Missing $ inserted” is probably caused by the underscores and bars. These characters in LaTeX have special meaning in math mode (which is delimited by $ characters). Try escaping them; e.g. update\_element instead of update_element.

However, if you’re trying to display code, a better solution would be to use the \verb command, which will typeset the text in a monospaced font and will automatically handle underscores and bars correctly (no need to escape them with \).

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