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Sep 7, 2020 at 23:03 comment added Conifold @LSpice Yes, the overline is parentheses, see Horvath's quote, "$d\overline{xy}$, that is $d(x y)$".
Sep 7, 2020 at 22:59 comment added LSpice I guess the overline is the old-fashioned symbol for grouping, as suggested by the gloss "that is $d(x y)$"?
Sep 7, 2020 at 19:10 vote accept Christina Daniel
Sep 7, 2020 at 11:10 history edited Conifold CC BY-SA 4.0
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Sep 7, 2020 at 11:02 history answered Conifold CC BY-SA 4.0