# Latex formula number, inline formula, formula space, long formula wrap, inline hyphen symbol

Source: Internet
Author: User
first, the formula number
X (k) =\sum_{n=0}^{n-1} x (n) e^{-j \frac{2 \pi}{n} k n}=\sum_{n=0}^{n-1} x (n) w_n^{kn},\quad k=0,1,..., N-1.

Next paragraph
(1)Add Begin{equation} and End{equation}, the formula will be automatically numbered; (2)The formula will be empty one line after another paragraph, or the next paragraph will not automatically indent the beginning.
two, in-line formulaIn-line formula: $formula$ another line formula: $$formula$$
three, the formula inside the space
 Two x Quad spaces A \qquad b Width of two M Quad spaces A \quad b The width of a m Large space A\ b 1/3m width Medium space A\;b 2/7m width Small spaces A\,b 1/6m width No spaces Ab Close A\!b Indent 1/6m Width

three, long formula line
Using split:
\begin{split}
F = \{f_{x} \in f_{c} &: (| s| > | c|) \\
&\quad \cap (\text{minpixels} < | s| < \text{maxpixels}) \ \
&\quad \cap (| s_{\text{conected}}| > | s| -\epsilon) \}
\end{split}

where \ \ represents the aligned position of the newline,&.

four, inline plus symbolIf written as $\sum_{k=0}^{n-1}$, the hyphen in the line will be written in the above and the following parameters as a corner label, should be written as $\sum\limits_{k=0}^{n-1}$, when the inline symbol does not change.

If you use the eqnarray environment , you can only display the numbers behind the above or the following equation, such as:
\begin{eqnarray}
a+b = 1 \ \
C+d = 2
The \end{eqnarray} number is displayed after the second equation.

Use the following statement to make the numbering appear in the middle of two equations:

\BEGIN{ARRAY}{L}
A+b=1 \ \
c+d=2
\end{array}

Sometimes it is crowded between the following equations to avoid this situation by adding \displaystyle to each equation, such as:

\BEGIN{ARRAY}{L}
\displaystyle a+b=1 \ \
\displaystyle c+d=2
\end{array}

The split environment can also be used to write numbers in the middle, such as:

\begin{split}
a+b=1\\
c+d=2
\end{split}

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