CSDN common complex formula template record

introduction

I usually write CSDN Blog uses MarkDown, Sometimes I will strike a long formula , The formula supports LaTex Input , The display of the formula is very beautiful . But sometimes you may forget the specific formula template . For the convenience of future writing , Make a record , Don't remember to come back directly copy.

1. The formula is centered

To make the formula look good , Generally before and after Use two $, As an interline formula , So the formula is centered . And if you use one before and after $ It's an in-line formula .

The formula between lines

$$x=y+1$$

According to the effect Centered ：

$$x=y+1$$

In line formula

$x=y+1$

According to the effect Left aligned ：

$x=y+1$

In contrast , The inter line formula display is quite elegant ~ Two... Are recommended $！

2. Representation of matrix

Matrix should be a very common formula , The following points should be paid attention to when using ：

<1> Before and after use environment
\begin{bmatrix}
\end{bmatrix}
<2> stay Second in each line - The last matrix element Before using & alignment
<3> stay After the last matrix element in each row Use \\ Line break , Of course, the last row of the matrix does not need

Take the following example , You can copy the following code directly and modify your formula ~

$$\begin{
    bmatrix}
a & b & c \\
d & ee &f \\
gx & h & i1
\end{
    bmatrix}$$

According to the effect by ：

$$\left[\begin{array}{ccc}a& b& c\\ d& ee& f\\ gx& h& i1\end{array}\right]$$

3. Left alignment of formula equal sign

Sometimes formula derivation has a continuous equal sign , At this time, if the equations are written in one line, it will be very long , You can consider writing a formula in a branch , The following points should be paid attention to when using ：

<1> Before and after use environment
\begin{aligned}
\end{aligned}
<2> stay Every line of the equation is preceded by an equal sign Use & alignment
<3> stay At the end of each line of the equation Use \\ Line break , Of course, the last line of the equation doesn't need

Take the following example , You can copy the following code directly and modify your formula ~

$$\begin{
    aligned}
a&=b+1\\
&=c+2\\
&=dx-e
\end{
    aligned}$$

According to the effect by ：

$$\begin{array}{rl}a& =b+1\\ & =c+2\\ & =dx-e\end{array}$$

【 Notice the difference MarkDown Maybe the environment is different , For example, I use VScode Write Markdown The left alignment of the formula equal sign is used in \begin{align*} and \end{align*}.】

4. Braces combine multiple formulas

Sometimes a formula is solved by several conditions , In this case, you need to combine multiple formulas with curly braces , The following points should be paid attention to when using ：

<1> How to write braces （ Note that \{ and . The combination of ）
Left brace How to write it ：
\left\}
\right.
Right brace How to write it ：
\left.
\right\}
<2> stay Before the first symbol on each line of the formula Use & Align equal sign
<3> stay At the end of each line of the formula Use \\ Line break , Of course, the last line of the equation doesn't need

Take the following example , You can copy the following code directly and modify your formula ~

Left brace ：

$$\left\{
    \begin{
    array}{
    l}
&a=b+1 \\
&a=c+2 \\
&ad=dx-e
\end{
    array}\right.$$

According to the effect by ：

$$\{\begin{array}{lc}& a=b+1\\ & a=c+2\\ & ad=dx-e\end{array}$$

Right brace ：

$$\left.\begin{
    array}{
    l} 
&a=b+1 \\ 
&a=c+2 \\ 
&ad=dx-e
\end{
    array}\right\}$$

According to the effect by ：

$$\begin{array}{lc}& a=b+1\\ & a=c+2\\ & ad=dx-e\end{array}\}$$