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How can I format mathematics here? - Help Center Many posts at Mathematics Stack Exchange include mathematical notation, written using $\mathrm\LaTeX$ commands surrounded by dollar signs If you see dollar signs with what appears to be gibberish between them, it just means that MathJax, the math rendering we use, isn't working properly for you There are two basic types of formula: Inline formulas are surrounded by single dollar signs For
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Use a list of values to select rows from a Pandas dataframe 2 Return df in the order of list_of_values In the OP, the values in list_of_values don't appear in that order in df If you want df to return in the order they appear in list_of_values, i e "sort" by list_of_values, use loc
Why people use `rel=noopener noreferrer` instead of just `rel . . . Yes, noreferrer implies noopener, making the additional value redundant And an old version of Firefox even requires that noopener be omitted when using noreferrer Using both probably became a habit after following outdated recommendations or lint rules See: ESLint "noreferrer" discussion WHATWG HTML spec - 4 6 7 14 Link type "noreferrer"