作者sa12e3 ((．＿．?))
看板Math
標題[工數] (a constant vector cross del operator) cross r
時間Mon May 2 08:52:07 2011
Let a be a constant vector and r = xi + yj + zk.
Ｖｅｒｉｆｙ ｔｈｅ ｇｉｖｅｎ ｉｄｅｎｔｉｔｙ.
Question: (a cross del operator) cross r = -2a
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◆ From: 140.130.208.8
1F：推 phs :what is "del" ? 05/02 09:15
※ 編輯: sa12e3 來自: 140.130.208.8 (05/02 09:21)