Display Math Equation in Post

There will be many posts demostrate how to transfer the mathematical laws to the codes, and the reversed flaw. I start from this famous equation:

$$E=m{c}^2$$

Use the steps 1 and 2 indtroducted in Fong Chun Chan’s post, my website is able to show the equation in any post. Because this theme use kramdown as the engine of markdown, I pass the step 4.

Here are the proof the central limitation theorem. Mix of inline and one-line equations.
We have a sequence of independent random variables,$$X_1,X_2,\dots$$
And the mean and variance of them:
Mean $$E\left[X_i\right]=\mu \in \left(-\mathrm{\infty }..\mathrm{\infty }\right)$$
Variance $$V\left(X_i\right)={\sigma }^2>0$$

Assume:
$$S_n=\sum _{i=1}^n{X}_i$$
Then:
$${\displaystyle \frac{S_n-n\mu }{\sqrt{n{\sigma }^2}}\stackrel{D}{\to }N\left(0,1\right)}$$ as $$n\to \mathrm{\infty }$$

Embedded tex codes in $$ ... $$, the equation was transfered inline or in single line. Thus I pass the step 3 of Fong Chun Chan’s method.

Note. Justify the last equation in 2021-05-13 20:51:38