cross caps
plural of Fahl
Impossible to soothe.
plural of cross cap
A village and civil parish in Bedford borough, Bedfordshire, England (OS grid ref TL0847). / A village and civil parish in central Shropshire, England (OS grid ref SO5095).
講義中、教授は球面にクロスキャップを取り付けることで向きづけ不可能な曲面ができることを示した。
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