Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
..Adam Riese
..Leonhard Euler
..Gottfried
Wilhelm Leibniz
..Mathematics
And Computation I..Isaac Newton
..Muhammed ibn
Musa al-Khwarizmi
..Johannes Kepler
..Nicaragua
..John Napier's
..Pythagoras
..Joseph-Louis
Lagrange
..Zhang Heng