| 释义 |
preˈfactor Math.
[pre- A. 2.]
The first of two factors in non-commutative multiplication.
1884J. W. Gibbs Elements of Vector Analysis §131 That is, the vector α × β as a pre- or post-factor in skew multiplication is equivalent to the dyadic {ob}βα - αβ{cb} taken as pre- or post-factor in direct multiplication. |