Pages 3-4.
Introduction to the יש מאין idea.
The RaMbaM insists on יש מאין and the Alter Rebbe’s follow up arguing that all the essential principles of faith revolve around it:
1) God is imminent
2) He knows what we’re doing
3) Prophecy
4) Hashgacha Protis and Miracles and more.
Proof for יש מאין from the idea of procreation.