This is the personal blog of Nate Burchell.
Nate,I've seen this before; I presume you'll tell why this isn't valid ?Dad
It's alright, I can do this sort of thing, I'm a math teacher. Granted, much of the universe and its denizens would vanish if too many people started using this result in other proofs. Don't try this at home.
It's the formula for marriage Nate!
that was your sister-in-law...yup yad adoo :)