call if minus

基本解釋

If you call this plus, then if you get a minus sign, you know that the velocity is in the opposite direction.
你若稱此為正號，你若想要一個負號，你們知道的,相反方向的速度。
Similarly, if m is equal to either plus 1 or minus 1, py we would in turn call it the p y orbital, or the p x orbital.
類似的，如果m等于+1或，我們可以叫它，或者px軌道。
The magnitude is one, of course and the momentum, if I leave this off we would call that minus one because it's a one-dimensional problem.
大小是1，而動量是，如果我們忽略不計，可把它稱作負一,因為這是一維問題。

1 Similarly, if m is equal to either plus 1 or minus 1, py we would in turn call it the p y orbital, or the p x orbital.
類似的，如果m等于+1或，我們可以叫它，或者px軌道。
麻省理工公開課 - 化學原理課程節(jié)選