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  • 1
    Simpler, but can one get the bar aligned with the bottom of $X$ and $Y$? Commented Sep 4, 2017 at 2:29
  • 1
    I incorporated \raisebox{}{} in the answer for bottom alignment Commented Mar 2, 2018 at 23:02
  • 1
    Simpler because poorer: to begin with, it is not treated as a relation, neither does it scale down in sub-/superscripts. Commented Apr 22, 2018 at 18:16
  • Amazing answer here! Commented Apr 9, 2019 at 22:13