Leibniz, binary arithmetic and the *Yi Jing*:

Daniel Goldenberg, "The algebra of the I Ching and its philosophical implications", *Journal of Chinese Philosophy*, **2**:2 (March 1975) 149–179 [low-resolution scan]

Andreas Schöter, "Boolean algebra and the *Yi Jing*", *The Oracle: The Joumal of Yijing Studies*, **2**:7 (Summer 1998) 19–34

relative probabilities of coin and yarrow stalk divination methods:

The so-called "Watkins Objection" to Terence McKenna's "Timewave" theory (2012 update)

Trigrams and real Clifford algebras (rather technical, of minimal interest)

Tony Smith writings on the *Yi Jing*, Clifford algebras, fundamental physics and just about everything else: [1] [2]

Charlie Higgins' webpages on "Mathematics of Alchemy & the I Ching" (now defunct, archived from 1999)