Wacław Franciszek Sierpiński (; 14 March 1882 – 21 October 1969) was a Polish mathematician.

He published over 700 papers and 50 books. Three well-known fractals are named after him (the Sierpiński triangle, the Sierpiński carpet and the Sierpiński curve), as are Sierpiński numbers and the associated Sierpiński problem. ==Educational background== Sierpiński enrolled in the Department of Mathematics and Physics at the University of Warsaw in 1899 and graduated four years later.

In 1903, while still at the University of Warsaw, the Department of Mathematics and Physics offered a prize for the best essay from a student on Voronoy's contribution to number theory.

Unwilling for his work to be published in Russian, he withheld it until 1907, when it was published in Samuel Dickstein's mathematical magazine 'Prace Matematyczno-Fizyczne' (Polish: 'The Works of Mathematics and Physics'). After his graduation in 1904, Sierpiński worked as a school teacher of mathematics and physics in Warsaw.

Unwilling for his work to be published in Russian, he withheld it until 1907, when it was published in Samuel Dickstein's mathematical magazine 'Prace Matematyczno-Fizyczne' (Polish: 'The Works of Mathematics and Physics'). After his graduation in 1904, Sierpiński worked as a school teacher of mathematics and physics in Warsaw.

He received his doctorate and was appointed to the University of Lwów in 1908. ==Life of Sierpiński== In 1907 Sierpiński first became interested in set theory when he came across a theorem which stated that points in the plane could be specified with a single coordinate.

He received his doctorate and was appointed to the University of Lwów in 1908. ==Life of Sierpiński== In 1907 Sierpiński first became interested in set theory when he came across a theorem which stated that points in the plane could be specified with a single coordinate.

During the years 1908 to 1914, when he taught at the University of Lwów, he published three books in addition to many research papers.

Sierpiński began to study set theory and, in 1909, he gave the first ever lecture course devoted entirely to the subject. Sierpiński maintained an output of research papers and books.

During the years 1908 to 1914, when he taught at the University of Lwów, he published three books in addition to many research papers.

These books were The Theory of Irrational Numbers (1910), Outline of Set Theory (1912), and The Theory of Numbers (1912). When World War I began in 1914, Sierpiński and his family were in Russia.

In 1916, Sierpiński gave the first example of an absolutely normal number. When World War I ended in 1918, Sierpiński returned to Lwów.

In 1916, Sierpiński gave the first example of an absolutely normal number. When World War I ended in 1918, Sierpiński returned to Lwów.

In 1919 he was promoted to a professor.

He spent the rest of his life in Warsaw. During the Polish–Soviet War (1919–1921), Sierpiński helped break Soviet Russian ciphers for the Polish General Staff's cryptological agency. In 1920, Sierpiński, together with Zygmunt Janiszewski and his former student Stefan Mazurkiewicz, founded the mathematical journal Fundamenta Mathematicae.

Marks of Lima (1930), Amsterdam (1931), Tarta (1931), Sofia (1939), Prague (1947), Wrocław (1947), Lucknow (1949), and Moscow (1967). For high involvement with the development of mathematics in Poland, Sierpiński was honored with election to the Polish Academy of Learning in 1921 and that same year was made dean of the faculty at the University of Warsaw.

His book Cardinal and Ordinal Numbers was originally published in English in 1958.

His work on functions of a real variable includes results on functional series, differentiability of functions and Baire's classification. Sierpiński retired in 1960 as professor at the University of Warsaw, but continued until 1967 to give a seminar on the Theory of Numbers at the Polish Academy of Sciences.

Two books, Introduction to General Topology (1934) and General Topology (1952) were translated into English by Canadian mathematician Cecilia Krieger. Another book, Pythagorean Triangles (1954), was translated into English by Indian mathematician Ambikeshwar Sharma, published in 1962, and republished by Dover Books in 2003; it also has a Russian translation.

He also continued editorial work as editor-in-chief of Acta Arithmetica, and as a member of the editorial board of Rendiconti del Circolo Matematico di Palermo, Composito Matematica, and Zentralblatt für Mathematik. In 1964 he was one of the signatories of the so-called Letter of 34 to Prime Minister Józef Cyrankiewicz regarding freedom of culture. Sierpiński is interred at the Powązki Cemetery in Warsaw, Poland. ==Honors received== Honorary Degrees: Lwów (1929), St.

His work on functions of a real variable includes results on functional series, differentiability of functions and Baire's classification. Sierpiński retired in 1960 as professor at the University of Warsaw, but continued until 1967 to give a seminar on the Theory of Numbers at the Polish Academy of Sciences.

Wacław Franciszek Sierpiński (; 14 March 1882 – 21 October 1969) was a Polish mathematician.

Two books, Introduction to General Topology (1934) and General Topology (1952) were translated into English by Canadian mathematician Cecilia Krieger. Another book, Pythagorean Triangles (1954), was translated into English by Indian mathematician Ambikeshwar Sharma, published in 1962, and republished by Dover Books in 2003; it also has a Russian translation.

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