Waclaw Sierpinski (1882-1969), a Polish mathematician working in number theory and set theory, described the self-repeating, or fractal design shown on the Finnish stamp at left. Sierpinski triangles are created by connecting the the midpoints of the sides of a triangle to form four smaller, interior triangles, and then repeating this process for each of the outside three triangles, ad infinitum. A Hungarian stamp commemorating a mathematical congress shows a design of Sierpinski pyramids, with Michelangelo's hand of God from the Sistine Chapel ceiling thrown in for good measure.A full description of the Polish School of Mathematics appears here. Some of its illustrious members included in a set with Sierpinski are Stanislaw Zaremba (1863-1942), Stefan Banach (1892-1945), and Zygmunt Janiszewski (1888-1920).

The above is a partial reproduction of, a webpage created and posted by Maiken Naylor for the Univerity at Buffalo Libaries's Sci-Philately: A Selective History of Science on Stamps exhibit.