To highlight an equation, \bbox
can be used. E.g,
1 2 3 4 5 6 | $$ \bbox[yellow] { e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n \qquad (1) } $$ |
To highlight an equation, \bbox
can be used. E.g,
1 2 3 4 5 6 | $$ \bbox[yellow] { e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n \qquad (1) } $$ |
\begin{array}…\end{array}
and \left\{…\right.
. For example, you get this:$$
\left\{
\begin{array}{c}
a_1x+b_1y+c_1z=d_1 \\
a_2x+b_2y+c_2z=d_2 \\
a_3x+b_3y+c_3z=d_3
\end{array}
\right.
$$
Use \require{cancel}
in the first formula in your post that requires cancelling; you need it only once per page. Then use:
$$\require{cancel}\begin{array}{rl}
\verb|y+\cancel{x}| & y+\cancel{x}\\
\verb|\cancel{y+x}| & \cancel{y+x}\\
\verb|y+\bcancel{x}| & y+\bcancel{x}\\
\verb|y+\xcancel{x}| & y+\xcancel{x}\\
\verb|y+\cancelto{0}{x}| & y+\cancelto{0}{x}\\
\verb+\frac{1\cancel9}{\cancel95} = \frac15+& \frac{1\cancel9}{\cancel95} = \frac15 \\
\end{array}
$$
These are issues that won’t affect the correctness of formulas, but might make them look significantly better or worse. Beginners should feel free to ignore this advice; someone else will correct it for them, or more likely nobody will care.
It is often easier to read tables formatted in MathJax rather than plain text or a fixed width font. Arrays and tables are created with the array
environment. Just after \begin{array}
the format of each column should be listed, use c
for a center aligned column, r
for right aligned, l
for left aligned and a |
for a vertical line. Just as with matrices, cells are separated with &
and rows are broken using \\
. A horizontal line spanning the array can be placed before the current line with \hline
.
In general, you have to search in long tables about a specific symbol you’re looking for, things like $\Psi$, $\delta$, $\zeta$, $\ge$, $\subseteq$ … And it turns out that this operation can be frustrating and time consuming, which can cause the buddy to abandon writing the complete $\LaTeX$ sentence in his answer, or in some cases, the complete answer itself.
Often people want a series of equations where the equals signs are aligned. To get this, use \begin{align}…\end{align}
. Each line should end with \\
, and should contain an ampersand at the point to align at, typically immediately before the equals sign.
For example,
Use $$\begin{matrix}…\end{matrix}$$
In between the \begin
and \end
, put the matrix elements. End each matrix row with \\
, and separate matrix elements with &
. For example,
1 2 3 4 5 6 7 | $$ \begin{matrix} 1 & x & x^2 \\ 1 & y & y^2 \\ 1 & z & z^2 \\ \end{matrix} $$ |
To see how any formula was written in any question or answer, including this one, right-click on the expression it and choose “Show Math As > TeX Commands”. (When you do this, the ‘$’ will not display. Make sure you add these. See the next point.)