作者sa12e3 ((．＿．?))
看板Math
标题[工数] (a constant vector cross del operator) cross r
时间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
已修正，感谢Ｐ大～"～
欢迎各位回答~
感谢大家～～
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1F：推 phs :what is "del" ? 05/02 09:15
※ 编辑: sa12e3 来自: 140.130.208.8 (05/02 09:21)