spaces around operators

[steveklabnik]

In section 1 at least

 x*x

most people write

x * x

and with

    n*factorial(n-1)

instead

n * factorial(n - 1)

a minor thing but I figured I'd mention it!

[stevedonovan]

Yes, I generally prefer letting operators breathe as well

[eddyb]

Lack of space after some commas probably applies as well.

[stevedonovan]

Yes, I've also put space after the comma after the format string in println. I'll keep the issue open since breathing is important ;)