Dec 31, 2014 · equation：等式，方程式 英英释义： An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; from which one is to determine …

An equation is any expression with an equals sign, so your example is by definition an equation. Equations appear frequently in mathematics because mathematicians love to use equal signs. A …

首先，我们要明白这两个环境分别能干什么。下面两段文字摘抄自l-short: 单独成行的行间公式在LaTeX里由equation环境包裹。 更多情况的是，我们需要罗列一系列公式，并令其按照等号对齐。目前最常 …

Jun 8, 2013 · How to distinguish linear differential equations from nonlinear ones? I know, that e.g.: $$ y''-2y = \\ln(x) $$ is linear, but $$ 3+ yy'= x - y $$ is nonlinear. Why?

Jan 27, 2015 · Sometimes it arrives to me that I try to solve a linear differential equation for a long time and in the end it turn out that it is not homogeneous in the first place. Is there a way to see direc...

May 28, 2013 · I love your answer for a line equation in the form of z = f (x, y)... Unfortunately calculating square roots can be impractical from the calculational standpoint and hence I really doubt any …

Jan 8, 2017 · The equation for your reflected line can be constructed using the point-slope form, $y=m (x-x_Q)+y_Q$. The point $ (x_Q,y_Q)$ is easily obtained as the intersection of your "mirror" line (the …

中文中“方程”（英文Equation）一词是如何来的？ 英语中 Equal 是相等的意思，用 Equation 表示方程很自然，很容易理解，因为方程的本质就是一个等式，只是含有未知数。 为何在中文中没有使用”… 显 …

Closed 8 years ago. Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. HardOCP …

May 24, 2014 · The way making a new equation (through a sequence of such modifications) can reveal what an unknown represents is by preserving the equality relationship while removing the knowns. …