Test equations

 

To blog math posts, I need to write equations. Lots of equations.

I found this page: https://www.quora.com/How-can-you-write-math-equations-on-Blogger-or-Blogspot. Then, I did what this page said.

An inline equation should be here $e^{i\theta }=\cos \theta +i\sin \theta$.... And a display equation should be below: $$e^{i\pi }=-1$$ and so on.

Can I write equations like this? $e^x=1+x+\cdots$

Here are sets of numbers.

$$\mathbb{N},\mathbb{Z},\mathbb{Q},\mathbb{R},\mathbb{C}$$

Vectors and matrices $$\left(\begin{array}{c}1\\ 2\\ 3\\ ⋮\\ n\end{array}\right)$$ $$\left[\begin{array}{cccc}{a}_{11}& a_{12}& \cdots & a_{1n}\\ a_{21}& a_{22}& \cdots & a_{2n}\\ ⋮& ⋮& \ddots & ⋮\\ a_{n1}& a_{n2}& \cdots & a_{nn}\end{array}\right]$$

Looks good!

$a+b=c$

`a + b = c`