Sandbox


 *  We can type things here just like word 
 * This is the second item in this list
 * $$x^2+y^2=z^2$$
 * $$\frac{\arctan (\pi)}{2}=0$$
 * $$\sqrt{2} $$is irrational
 * $$\frac{1}{1+\frac{3}{\pi}}>0$$
 * $$ \tan(\pi/2)=1$$
 * $$1+1=2$$
 * Let $$\mu$$ be a measure on a measurable space. A measurable space is just a set $$X$$equipped with a sigma algebra $$\sigma$$.

/ Comment: It would be helpful for all answers to be preceded by the questions.