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ベクトル 外積の別の表記 大きさと方向を持つ量(少なくとも2つ … · i×i = j×j = k×k = 0, i×j = –j×i = k, j×k = –k×j = i, k×i = –i×k = j が成り立つ.従って、直交ベクトル間の外積のみが残り、
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