MathJax test

Add some notes here...

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

Some Prolog, it's important we get this right.

f(X,Y,Z) :-
    Z is Y + X + 1,
    write('testing this out').

member(X, [X|Xs]).
member(X, [_|Xs]):-
    member(X, Xs).

Some Scheme

(define (area-of-disk r)
  (* 3.14 (* r r)))
  (friends 'of '(parentheses))

Some C code

  int main(argc, argv[]) {
      printf("Hello, world!\n");
      return 0;
  }

Some Python

  def lul():
      x = 1 + 2
  return x