Welcome to our subforum for international members!
Please read the following before posting.
Change the default language to English
The default language of our forum software is Vietnamese. You might want to change it to English for your account. Click on the Vietnamese button near the bottom-left corner of the forum, choose English (USA).
Mathematical typesetting using $\LaTeX$
We use MathJax for providing $\LaTeX$-like mathematical typesetting. To facilitate the typesetting, we embedded an equation editor into the forum text editor. You can find it by clicking on the $f_x$ button on the toolbar. Details and examples can be found here.
We should note that, in addition to basic $\LaTeX$ commands, we also support AMS equation numbering and referencing. For example:
Some numbered equations: \begin{equation} a+b=c \label{eq:first} \end{equation} \begin{align} x+y&=z \label{eq:second} \\ a+b+c+d+e+f &= x+y+z \end{align} Referencing (the equation numbers are clickable): According to \eqref{eq:first} we have $a=c-b$, and according to \ref{eq:second} we have \begin{equation} x=z-y. \end{equation}
will result in:
Some numbered equations:
\begin{equation}
a+b=c \label{eq:first}
\end{equation}
\begin{align}
x+y&=z \label{eq:second} \\
a+b+c+d+e+f &= x+y+z
\end{align}
Referencing (the equation numbers are clickable):
According to \eqref{eq:first} we have $a=c-b$, and according to \ref{eq:second} we have \begin{equation} x=z-y. \end{equation}
Choose a good title
Please choose a good and descriptive title for your topic/thread. To ensure maximal descriptiveness of your question's title, review it before posting and ensure that it (still) adequately describes your topic's content.
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Make your title your question/subject. Use your title to convey as much information about your question/subject as possible.
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$\LaTeX$ works in titles. We recommend you to use $\LaTeX$ in your title if that can help describing better your question/subject. Be sure to include at least some plain words, not just equations!
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There is no need to refer to your personal situation in the title. For example, the title Help me solve $a^2+b^2=c^2$ for my exam preparation is very specific to your personal situation. Deriving the formula for Pythagorean triples: $a^2+b^2=c^2$ would be a more universal, better title.
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Your post should be clear without the title.
If you have any questions or suggestions, please let us know by posting in this topic.
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The Admins.