Calculating pi with Catalan Numbers
A fixed-point arithmetic approach to calculating digits of pi using the arcsine series and Catalan numbers.
Exploring Almost Isosceles Pythagorean Triples
A short explanation of triples whose two smaller legs differ by one, with a recurrence for generating examples.
History of Cryptography
An overview of cryptography from ancient ciphers through public-key systems and secure communication.
The Golden Ratio
A compact introduction to phi, Fibonacci ratios, and why some popular design and nature claims need care.