The Simplest Introductory Book on Calculus
An introductory calculus book written by British physicist Silvanus Phillips Thompson in 1910, more than a century ago
The Best Introductory Books on Differential Equations
An introductory ordinary differential equations book tailored for engineering students, especially those in physics.
The Best Introductory Books on Probability Theory
One of the best books for learning how probability models real-world systems
An Alternative "Origami" Website
This site can simulate the folding process of any origami pattern, but instead of folding the paper sequentially, it attempts to fold all creases simultaneously. The principle involves iteratively solving the subtle geometric displacements of an initially flat sheet caused by crease forces.
The Trilogy of Mathematical Analysis: Part One
One of the Most Classic Textbooks in the Field of Mathematical Analysis