MathJax = { tex : {tags : "all"}};
This is an example:$$x+1=\frac{x}{3}$$. Ακολουθούν άλλα παραδείγματα
\begin{equation*}
y=\frac{\sum_{i=0}^{n}({x_{i}^{2})}{x_{i}}
\end{equation*}
This is Equation \ref{eq:1}.
Here is a labeled eq:$$x+1\over\sqrt{1-x^2}\label{eq:1}$$
\begin{align}
x &=y_1-y_2+y_3-y_4-\dots
&& \text{ by \eqref{eq:1}}\\
&=y'\circ y^* && \text{(by \eqref{eq:1})}\\
& y(0) y' * \text{by Axiom 1.}
\end{align}
\begin{align}
a &=b \label{ref3} \\
y &=c+d