dots within \xrightarrow · Issue #263 · latex3/latex2e · GitHub
TeX and Typography on Twitter: "The commands \xleftarrow{} and \xrightarrow{} let you easily put things on top of arrow symbols. https://t.co/Hjvi9HvsRS" / Twitter
double negation of arrow in latex - Stack Overflow
arrows - Two-headed version of \xrightarrow - TeX - LaTeX Stack Exchange
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