Anyway, this is all just to say that the change in potential energy is negative F times the change in position.

F(力大小)乘以位置变化量有号因为 如果你让这个力一直推着你。

And I don't like that negative sign in the mean.

我不喜欢均值号。

See any circles with two negative signs?

看到有任何两个号圆圈吗？

So that just alternating series with plus and minus signs as the coefficient.

因此这只以号交替级数作为系数。

So I'll just put a negative up there.

所以我就这放一个号。

And then finally we have plus minus.

然后最后我们有号。

Similar feeling to the way perhaps Dirac had felt about this positron, plus or minus.

类似地，或许狄拉克对电子感觉也如此，号不确定。

Now, square root usually has a plus or minus sign when you take it.

，当你取平方根时，通常会有一个号。

Well I will now magically separate the negative sign from the 4. 1, 2, abracadabra.

好吧，我会神奇地把号从4上分开。一、二、变。

Now it is negative 1 time 4. With multiplication you can detach and reattach positive or negative signs from the number.

1乘以4。乘法中，你可以从数字上分离或重新附加上号或号。

If you ignore the negative signs for a minute these are the exact same numbers arranged in the same pattern as in the main triangle.

如果您暂时忽略号，这些数字就按照与主三角形相同模式排列完全相同数字。

This value – the charge of a single electron in Coulombs – is known as the elementary charge, and it's denoted with a lowercase " e" .

一个号。这个值，值 一个电子电荷，以库仑为单位，你知道。

Well, one way to think about what signs are is as directions; positive means pointing right along a number line, and negative means pointing left along that number line.

好吧，思考符号一种方式将其视为方向；号意味着数轴上向右指，号则意味着数轴上向左指。

First off, the convention in the context of Fourier transforms is to think about rotating in the clockwise direction, so let's go ahead and throw a negative sign up into that exponent.

首先， 傅叶变换上下文中， 我们习惯于考虑顺时针旋转，所以我们先把一个号放进指数。

Now, if you want to calculate the magnifying power of the telescope, just start with the same equation you used for the magnifying lens, but with a negative sign, because the image is flipped.

，如果你想计算望远镜放大倍率，就从放大镜使用同一个公式开始， 但要加上号， 因为图像被翻转了。

So plus X times the negative expected value of Y. So I'll just say minus X times the expected value of Y. And that negative sign comes from this negative sign right over here.

所以加上X乘以Y期望值。我直接说减去X乘以Y期望值。这个号就来自这这个号。

You have to have that positive mindset that there is always something out there and it is a hard one to have when you have zero dollars and the negative sign in your bank account.

你必须保持积极心态，相信总有机会等待着你，而当你银行账户一分钱都没有，还挂着号时，这种心态确实难以维持。

Which means that the induced emf in a coil of wire is equal to the number of coils, times the change in magnetic flux over the change in time, all multiplied by a negative sign.

这意味着线圈中感应电动势为 等于线圈数乘以磁通量随时间变化变化，全部乘以号。

Geometrically, the meaning of this function is that for any input vector X-Y-Z, you consider the parallelopyped defined by this vector, V and W, then you return its volume with a plus or minus sign, depending on orientation.

几何上 这个函数意义 对于任何输入向量X-Y-Z 你考虑由这个向量V和W定义平行体 然后你返回它体积 根据方向带号或号。