1.
The explanation requiring the fewest assumptions is most likely to be correct.
William of Ockham
3.
With all things being equal, the simplest explanation tends to be the right one.
William of Ockham
5.
Of two equivalent theories or explanations, all other things being equal, the simpler one is to be preferred.
William of Ockham
6.
Nature operates in the shortest way possible.
Aristotle