Manly Palmer Hall was a prolific writer and mystic, widely recognized as a leading scholar in the fields of religion, mythology, mysticism, and the occult. “Pythagorean Mathematics” is the article, included in “The Secret Teachings of All Ages” volume and dedicated to Pythagoras, the greatest ancient philosopher, mathematician and mystic. It is no secret that with the death of Pythagoras the great key to the mathematic was lost. For nearly 2500 years philosophers of all nations have attempted to unravel the Pythagorean skein, but apparently none has been successful. The author presents the extracts of several works, dedicated to the subject. Enjoy the reading!