ssued by Greece on Aug. 20, 1955, to commemorate Pythagoras's Congress and the 2500th anniversary of the founding of the first school of philosophy by Pythagoras pythag.jpg, theorem.jpg, pythag2.jpg, pythag4.jpg, pythag5.jpg;

issued by San Marino on April 21, 1982 pythag3.jpg issued by Surinam in 1972 theorem2.jpg;

issued by Macedonia on Feb. 6, 1998,

to commemorate the 2500th anniversary of the death of Pythagoras pythagoras6.jpg