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分类:
- Commemorative coins of the Russian Federation, 2007
- 2 Russian rubles coins (2007)
- Silver coins of the Russian Federation
- Commemorative coins of the Russian Federation, Great personalities of Russia
- Leonhard Euler
- Mathematical formulas
- Series (mathematics)
- Mathematics on coins
- Coins on white background
- Mathematicians on coins
- Basel problem
- Tricentennial coins
- Celestial spheres
- Formulas on coins