The National Bank of Poland have issued two new precious metal coins which pay tribute to Stefan Banach (1892-1945) co-founder of the Polish School of Mathematics. His name is synonymous with one of the most important Polish Mathematical Society Prizes (which he also co-founded and served as its president, from 1939 until his death), and the medal of Polish Academy of Sciences. Professor Stefan Banach developed the basic concepts and theorems of functional analysis, and terms such as the Banach spaces are known to every mathematician in the world.
The coins, one gold and one silver, are struck at the Mint of Poland in Warsaw and were designed by engraver / artist Robert Kotowicz and include front facing portraits of Banach along with relevant elements of his work and well-known theories.
The obverse of the gold coin includes the bust of Stefan Banach situated to the right side and in the background there is a pattern of geometric compositions. Under the bust there is the facsimile of a diagonally handwritten mathematical formula stating the theorem of Banach’s fixed point. The same formula is also the graphic feature which is highlighted. The year of issue “2012” the denomination of 200 Zlotych and the text “RZECZPOSPOLITA POLSKA” is included in the overall design.
The obverse of the silver coin also includes Banach’s portrait positioned to the right side along with a pattern of circular linear mapping representing modern functional analysis. The text “STEFAN BANACH 1892 – 1945” is placed above the smaller diagram in three lines. The reverse features the image of the now familiar diagram ”box within a box” along with the actual mathematical formula, which occurs with the Hahn-Banach theorem. The text “RZECZPOSPOLITA POLSKA” along with the year of issue and the coin’s denomination of 10 Zlotych together with the crowned eagle, the national symbol of Poland completes the design.
The gold coin is struck in .900 to proof quality with a weight of 15.1 grams and a diameter of 27 mm. A total mintage of up to 4,000 pieces has been authorized. The silver coin is struck in .925 silver to proof quality with a weight of 14 grams and a diameter of 32 mm. A total mintage of up to 45,000 pieces has been authorized.
For more information on this and other coins issued by the National Bank of Poland, please visit their website at: http://www.nbp.pl/home.aspx?f=/aktualnosci/wiadomosci_2012/20120402_moneta_stefan_banach.html