Category:Jan Ptaszycki

**Jan Ptaszycki**
	Polish-Russian mathematician
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Date of birth	4 June 1854; Volhynian Governorate; Jan Ptaszycki
Date of death	4 February 1912; Saint Petersburg
Country of citizenship	Russian Empire;
Occupation	teacher;
Employer	Mikhailovskaya Military Artillery Academy;
Native language	Polish;
Sibling	Stanisław Ptaszycki;
Authority file
	Q15087358; VIAF ID: 309875272; NUKAT ID: n2018295630; PLWABN ID: 9810680616105606
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