# Sofia Kovalevskaya: the woman who covered the walls of her room in theorems

When she was eleven years old, **Sofia** (sometimes called Sonja) **Kovalevskaya** covered the walls of her room in note sheets about differential and integral calculus by the Russian mathematician **Mikhail Ostrogradski**. These notes were from her father’s university years. This was how Sofia became familiar with calculus. Her first introduction to calculus was by the hand of her uncle **Pyotr Krukovsky**. He taught her the basics until she developed such a fascination with mathematics that she described it as **“a mysterious science which opens up to its initiates a new world of wonders, inaccessible to ordinary mortals.”**

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