A Test to Github Math Engine

A Test to Github Math Engine

This article is for testing the MathJax support in posts.

When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$ and they are \(x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\)

\[\sum_{i=0}^n i^2 = \frac{(n^2+n)(2n+1)}{6}\] \[\begin{align} &\begin{bmatrix} 1&2&1\\2&4&2\\1&2&1 \end{bmatrix} \begin{bmatrix} x_1\\x_2\\x_3 \end{bmatrix}\\ &=(x_1+2x_2+x_3)\begin{bmatrix} 1\\2\\1\end{bmatrix}.\nonumber \end{align}\] \[\begin{equation} \Delta_A(\lambda)=\sum_{k=0}^n (-1)^{n-k}\lambda^k \sigma_{n-k}(A)= \sum_{k=0}^n (-1)^{k}\lambda^{n-k }\sigma_{k}(A). \label{eq:characteristic} \end{equation}\] \[p \left( h _ { j } = 1 \right) = \frac { 1 } { 1 + \exp \left( - b _ { j } - \sum _ { i \in \operatorname { vis } } v _ { i } w _ { i j } \right) }\]

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