date topic
113 Jan Eruasia [jpg]
213 Jan Riverine civilizations [gif]
313 Jan Language groups [gif]
413 Jan World religions [png]
513 Jan Neugebauer's diagram [jpg]
620 Jan The roots of our place-value system
727 Jan Low-degree equations: a rapid rurvey
827 Jan Space-time plot
927 Jan Space-time data
1026 Feb Ancient approximations
1124 Mar Continued fractions
122 Apr Cardano's formulas
1316 Apr Projective geometry
1421 Apr Using a camera lucida [jpg]
1521 Apr Diagram of a camera lucida [png]
1623 Apr History of perspective: major figures
1725 Apr History of perspective: important examples