Triple product expansion

Main article: Triple product

This is a very useful identity (also known as Lagrange’s formula) involving the dot- and cross-products. It is written as

which is easier to remember as “BAC minus CAB”, keeping in mind which vectors are dotted together. This formula is commonly used to simplify vector calculations in physics.

From http://en.wikipedia.org/wiki/Dot_product

Nhiều tính chất khác tại http://en.wikipedia.org/wiki/Cross_product

It is not associative, but satisfies the Jacobi identity:

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August 13, 2011 at 1:37

Ngoài tên gọi trên thì công thức trên còn có tên là R…?