Aristotelian Principle of Non-Contradiction

Wittgenstein's use of practice in a way that helps us regulate our experience essentially is going to be really important for practice. This is where the notion that you can't even talk if you don't have the principle of non-contradiction, you're not going to be able to even talk about the river or think about making any decisions at all. So he's expanding that. He's expanding that Aristotelian idea as we mentioned last time to other propositions. But I was just thinking of this idea of things disappearing and appearing in the principle of sufficient reason.