From Wikipedia, the free encyclopedia
呢個幾何形狀描述嘅其實就係一個波形,所以叫做「球」。
球面可以推廣去任意維度。對任何自然數 n,一個 n-球面(通常寫做),係喺 (n+1)-維歐幾里得空間入邊同一個中心點成固定距離 r 嘅所有點,呢度 r 係一個正實數。
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