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2 Hryvni Oleksandr Lyapunov
| Issuer | National Bank of Ukraine |
|---|---|
| Year | 2007 |
| Type | Non-circulating coin |
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| Obverse description | The Small National Emblem of Ukraine (trident) is displayed prominently in the upper field, beneath which the two-line legend НАЦІОНАЛЬНИЙ / БАНК УКРАЇНИ (National Bank of Ukraine) is inscribed. A schematic geometric diagram representing a celestial mechanics problem is depicted in the central field as a design element. The denomination 2 ГРИВНІ and the date 2007 appear in the lower field, flanked by the mint logo of the National Bank of Ukraine Banknote Printing and Minting Works. |
|---|---|
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| Obverse lettering | НАЦІОНАЛЬНИЙ БАНК УКРАЇНИ 2 ГРИВНІ 2007 |
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Lyapunov spent much of his career in Kharkiv, then part of the Russian Empire, where he developed the mathematical stability theory that now bears his name. His 1892 doctoral dissertation, "The General Problem of the Stability of Motion," laid the groundwork for what became foundational to 20th-century control theory and dynamical systems — work largely ignored in the West until Soviet engineers applied it to aerospace problems decades later.
Ukraine's commemorative 2 hryvni series has consistently claimed figures with strong Kharkiv and Kyiv academic ties. Lyapunov died in Odessa in 1918, by suicide, one day after his wife's death.