How can I edit a solution to an exercise?
Select the chapter of the exercise on the side bar menu and then select your exercise. Once on the page of the exercise, select "edit" at the bottom left of the page. You then arrive on the wiki-editor where you can write your solution. Do not forget to save when you have finished!
Find general informations on the wiki syntax on the wiki-syntax page.
And have a look at the first exercise of Chapter 1 for an example.
How can I write a mathematical formula?
Mathematical formulas can be simply written in Latex.
Inline formula
If you want to insert an inline formula simply type
[[$\sin(\pi)=0$]]
in order to display $\sin(\pi)=0$. Easy isn't it?
Example:
in order to write the following sentence
"the least square estimator is defined by $\widehat\beta=(X^TX)^{-1}X^TY$ when $X^TX$ is non singular"
type
the least square estimator is defined by [[$\widehat\beta=(X^TX)^{-1}X^TY$]]
when [[$X^TX$]] is non singular
Equation display
You can also display more complex equation on a specific display.
Example :
in order to write the following sentence
"The Gaussian concentration inequality ensures that
(1)for any $x>0$."
type
The Gaussian concentration inequality ensures that
[[math]]
P(F(X)>E[F(X)]+x) \leq e^{-x^2/2},
[[/math]]
for any [[$x>0$]].
Find more examples and features in the wiki-syntax math page.