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Sentence
Span Details
古い
old; aged; antique; long-standing; time-honored; of the distant past; stale; hackneyed; corny; old-fashioned; outmoded; out-of-datei-adjective
数学
mathematicsnoun
書
book; document; calligraphy; penmanship; handwriting; letter; notenoun, noun suffix
では
contrastive で + は; then; well thengrammar
「角壔」
prismnoun
という
called; that; the fact thatgrammar
表記
written representation; notation; orthography; writing on a surface; inscribing on the facenoun, suru verb
を
object markergrammar
見かける
happen to see; notice; catch sight ofichidan verb
ことがある。
have done (something); something has occurred; sometimes; there are times when-> 事があるexpression, verb