📖 978-1-951619-04-6 Set Theory for Pre-Beginners: An Elementary Introduction to Sets, Relations, Partitions, Functions, Equinumerosity, Logic, Axiomatic Set Theory, Ordinals, and Cardinals
📖 978-1-951619-09-1 Pure Mathematics For Pre-beginners: An Elementary Introduction To Logic, Set Theory, Abstract Algebra, Number Theory, Real Analysis, Topology, Complex Analysis, And Linear Algebra