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（1）$45^{\circ}$&（2）这样定义一下用起来可能方便一些：&&&\def\degree{${}^{\circ}$}&&&90\degree&
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推荐过这篇日志的人：
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{list wl as x}{/list}latex中文摘要中的关键词keywords
老是显示为关键字
要怎么把字改成词_latex吧_百度贴吧
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latex中文摘要中的关键词k收藏
latex中文摘要中的关键词keywords
老是显示为关键字
要怎么把字改成词
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具体代码是什么，这样不知道什么问题。
登录百度帐号推荐应用latex中怎样加入keywords
latex中怎样加入keywords
09-01-02 &匿名提问
加入关键字就以latex为主啊
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LaTeX技巧10：LaTeX数学公式输入初级入门
LaTeX最强大的功能就是显示美丽的数学公式，下面我们来看这些公式是怎么实现的。
1、数学公式的前后要加上 $ 或
\( 和 \)，比如：$f(x) = 3x + 7$ 和
\(f(x) = 3x
+ 7\) 效果是一样的；
如果用 \[ 和 \]，或者使用 $$ 和 $$，则改公式独占一行；
如果用 \begin{equation} 和 \end{equation}，则公式除了独占一行还会自动被添加序号，
如何公式不想编号则使用 \begin{equation*} 和 \end{equation*}.
普通字符在数学公式中含义一样，除了
# $ % & ~ _
若要在数学环境中表示这些符号# $ %
& _ { }，需要分别表示为\# \$ \% \& \_ \{
\}，即在个字符前加上\。
3、上标和下标
用 ^ 来表示上标，用
来表示下标，看一简单例子：
$$\sum_{i=1}^n a_i=0$$
$$f(x)=x^{x^x}$$
这里有更多的
4、希腊字母
更多请参见
5、数学函数
6、在公式中插入文本可以通过 \mbox{text} 在公式中添加text，比如：
\documentclass{article}
\usepackage{CJK}
\begin{CJK*}{GBK}{song}
\begin{document}
$$\mbox{对任意的$x&0$}, \mbox{有 }f(x)&0.
\end{CJK*}
\end{document}
7、分数及开方
\frac{numerator}{denominator}
\sqrt{expression_r_r_r}表示开平方，
\sqrt[n]{expression_r_r_r}
表示开 n 次方.
8、省略号（3个点）
\ldots 表示跟文本底线对齐的省略号；\cdots
表示跟文本中线对齐的省略号，
表示为 $$f(x_1,x_x,\ldots,x_n) = x_1^2 +
x_2^2 + \cdots + x_n^2 $$
9、括号和分隔符
() 和 [ ] 和 ｜ 对应于自己；
{} 对应于 \{ \}；
|| 对应于 \|。
当要显示大号的括号或分隔符时，要对应用 \left 和 \right，如：
\[f(x,y,z) = 3y^2 z \left( 3 +
\frac{7x+5}{1 + y^2} \right).\]对应于
只用与匹配，本身是不显示的，比如，要输出：
则用 $$\left. \frac{du}{dx}
\right|_{x=0}.$$
10、多行的数学公式
可以表示为：
\begin{eqnarray*}
\cos 2\theta & = & \cos^2 \theta -
\sin^2 \theta \\
& = & 2 \cos^2 \theta - 1.
\end{eqnarray*}
其中&是对其点，表示在此对齐。
*使latex不自动显示序号，如果想让latex自动标上序号，则把*去掉
The \emph{characteristic polynomial}
$\chi(\lambda)$ of the
$3 \times 3$~matrix
\[ \left( \begin{array}{ccc}
a & b & c \\
d & e & f \\
g & h & i \end{array}
is given by the formula
\[ \chi(\lambda) = \left| \begin{array}{ccc}
\lambda - a & -b & -c \\
-d & \lambda - e & -f \\
-g & -h & \lambda - i \end{array}
\right|.\]
c表示向中对齐，l表示向左对齐，r表示向右对齐。
12、导数、极限、求和、积分(Derivatives, Limits, Sums and Integrals)
The expression_r_r_rs
are obtained in LaTeX by typing
\frac{du}{dt} and \frac{d^2
respectively. The mathematical symbol
is produced using \partial. Thus the Heat
is obtained in LaTeX by typing
\frac{\partial u}{\partial t}
= h^2 \left( \frac{\partial^2 u}{\partial x^2}
+ \frac{\partial^2 u}{\partial y^2}
+ \frac{\partial^2 u}{\partial z^2}\right)\]
To obtain mathematical expression_r_r_rs such
in displayed equations we type \lim_{x \to +\infty}, \inf_{x
& s} and \sup_K respectively. Thus to
(in LaTeX) we type
\lim_{x \to 0} \frac{3x^2 +7x^3}{x^2 +5x^4} = 3.\]
To obtain a summation sign such as
we type \sum_{i=1}^{2n}. Thus
is obtained by typing
\sum_{k=1}^n k^2 = \frac{1}{2} n (n+1).\]
We now discuss how to obtain integrals in mathematical
documents. A typical integral is the following:
This is typeset using
\int_a^b f(x)\,dx.\]
The integral sign is typeset using the control sequence \int,
and the limits of integration (in this case a and b are treated as
a subscript and a superscript on the integral sign.
Most integrals occurring in mathematical documents begin with an
integral sign and contain one or more instances of d followed by
another (Latin or Greek) letter, as in dx, dy and dt. To obtain the
correct appearance one should put extra space before the d, using
are obtained by typing
\int_0^{+\infty} x^n e^{-x} \,dx = n!.\]
\[ \int \cos \theta \,d\theta = \sin \theta.\]
\[ \int_{x^2 + y^2 \leq R^2} f(x,y)\,dx\,dy
= \int_{\theta=0}^{2\pi} \int_{r=0}^R
f(r\cos\theta,r\sin\theta) r\,dr\,d\theta.\]
\int_0^R \frac{2x\,dx}{1+x^2} = \log(1+R^2).\]
respectively.
In some multiple integrals (i.e., integrals containing more than
one integral sign) one finds that LaTeX puts too much space between
the integral signs. The way to improve the appearance of of the
integral is to use the control sequence \! to remove a thin strip
of unwanted space. Thus, for example, the multiple integral
is obtained by typing
\int_0^1 \! \int_0^1 x^2 y^2\,dx\,dy.\]
Had we typed
\int_0^1 \int_0^1 x^2 y^2\,dx\,dy.\]
we would have obtained
A particularly noteworthy example comes when we are typesetting
a multiple integral such as
Here we use \! three times to obtain
suitable spacing between the integral signs. We typeset this
integral using
\!\!\! \int_D f(x,y)\,dx\,dy.\]
Had we typed
\int_D f(x,y)\,dx\,dy.\]
we would have obtained
The following (reasonably complicated) passage exhibits a number
of the features which we have been discussing:
would typeset this in LaTeX by typing In non-relativistic wave
mechanics, the wave function
$\psi(\mathbf{r},t)$ of a particle satisfies the
\emph{Schr\"{o}dinger Wave Equation}
\[ i\hbar\frac{\partial \psi}{\partial t}
= \frac{-\hbar^2}{2m} \left(
\frac{\partial^2}{\partial x^2}
+ \frac{\partial^2}{\partial y^2}
+ \frac{\partial^2}{\partial z^2}
\right) \psi + V \psi.\]
It is customary to normalize the wave equation by
demanding that
\[ \int \!\!\! \int \!\!\! \int_{\textbf{R}^3}
\left| \psi(\mathbf{r},0) \right|^2\,dx\,dy\,dz = 1.\]
A simple calculation using the Schr\"{o}dinger wave
equation shows that
\[ \frac{d}{dt} \int \!\!\! \int \!\!\! \int_{\textbf{R}^3}
\left| \psi(\mathbf{r},t) \right|^2\,dx\,dy\,dz = 0,\]
\[ \int \!\!\! \int \!\!\! \int_{\textbf{R}^3}
\left| \psi(\mathbf{r},t) \right|^2\,dx\,dy\,dz = 1\]
for all times~$t$. If we normalize the wave function in this
way then, for any (measurable) subset~$V$ of $\textbf{R}^3$
and time~$t$,
\[ \int \!\!\! \int \!\!\! \int_V
\left| \psi(\mathbf{r},t) \right|^2\,dx\,dy\,dz\]
represents the probability that the particle is to be found
within the region~$V$ at time~$t$.
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latex 如何写输入论文的关键字啊
\textbf{Keywords:} A, B, C, D
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