hello, world!

$$ \int_{0}^{\infty} e^{-x^2} dx = \frac{\sqrt{\pi}}{2} $$

  graph TD
    Expr[Expression]
    Expr --> Mult[*]
    Mult --> Add[+]
    Mult --> Num3[4]
    Add --> Num1[2]
    Add --> Num2[3]

fn fibonacci(n: u32) -> u32 {
    match n {
        0 => 0,
        1 => 1,
        _ => fibonacci(n - 1) + fibonacci(n - 2),
    }
}