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- Ostrogradskiǐ-Gauss formula
- Ostrogradskiǐ-Liouville formula
- Ostrogradskiǐ method
- Ostrogradsky
- Ostrogradsky Gauss formula
- Ostrogradsky-Gauss formula
- Ostrovskiǐ
- Ostrowski
- Ostrowski-Hadamard gap theorem
- Ostrowski inequality
- Ostrowski theorem
- ost-translational modification
- Ostwald color system
- Ostwald crater
- Ostwald ripening
- O subdwarf
- Osumi
- Osun State
- O supergiant
- Oswald Külpe
- Oswald Mathias Ungers
- Oswald Spengler
- Oswald Theodore Avery
- Oswald von Wolkenstein
- OSY