half-open intervals
(malacology) In reference to ribs on shells, with the shape of a concave bend towards the aperture, but initially straight.
Related to Demetia or Dyfed in southern Wales.
plural of half-open interval
(nautical) To sail on a beam reach.
解集合をプロットするときは、半開区間の端点をはっきり示すようにしてください。
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