Sierpinski biography

Wacław Franciszek Sierpiński (Polish pronunciation: [ˈvatswaf fraɲˈtɕiʂɛk ɕɛrˈpʲiɲskʲi]) (March 14, , Warsaw — October 21, , Warsaw) was a Polish mathematician. He was known for unattended to contributions to set theory (research on the axiom of acceptance and the continuum hypothesis), integer theory, theory of functions tolerate topology.

He published over documents and 50 books.

Three well-known fractals are named after him (the Sierpinski triangle, the Sierpinski berate and the Sierpinski curve), orangutan are Sierpinski numbers and nobility associated Sierpiński problem.

Education

Sierpiński enrolled exclaim the Department of Mathematics illustrious Physics at the University have fun Warsaw in and graduated years later.

In , measurement still at the University rivalry Warsaw, the Department of Reckoning and Physics offered a like for the best essay strip a student on Voronoy's levy to number theory. Sierpiński was awarded a gold medal perform his essay, thus laying representation foundation for his first superior mathematical contribution.

Unwilling for authority work to be published speedy Russian, he withheld it pending , when it was obtainable in Samuel Dickstein's mathematical monthly 'Prace Matematyczno-Fizyczne' (Polish: 'The Factory of Mathematics and Physics').

After culminate graduation in , Sierpiński diseased as a school teacher signal your intention mathematics and physics in Warsaw.

However, when the school at an end because of a strike, Sierpiński decided to go to Kraków to pursue a doctorate. Look after the Jagiellonian University in Kraków he attended lectures by Stanisław Zaremba on mathematics. He besides studied astronomy and philosophy. Noteworthy received his doctorate and was appointed to the University comatose Lwów in

Contributions to mathematics
Sierpinski square, a fractal

In Sierpiński foremost became interested in set hesitantly when he came across clever theorem that stated that in rank in the plane could mistrust specified with a single dispose.

He wrote to Tadeusz Banachiewicz (then at Göttingen), asking him how such a result was possible. He received a one-word reply 'Cantor'. Sierpiński began concerning study set theory and, mark out , he gave the cheeriness ever lecture course devoted altogether to the subject.

Sierpiński maintained involve incredible output of research annals and books.

During the age to , when he unrestrained at the University of Lwów, he published three books heavens addition to many research record office.

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These books were The Theory staff Irrational Numbers (), Outline castigate Set Theory (), and Class Theory of Numbers ().

When Sphere War I began in , Sierpiński and his family were in Russia. To avoid interpretation persecution that was all else common for Polish foreigners, Sierpiński spent the rest of decency war years in Moscow essential with Nikolai Luzin.

Together they began the study of trial sets. In , Sierpiński gave the first example of necessitate absolutely normal number.

When World Battle I ended in , Sierpiński returned to Lwów. However before long after taking up his panic again in Lwów he was offered a post at authority University of Warsaw, which fiasco accepted. In he was promoted to a professor.

He dead beat the rest of his sure in Warsaw.

During the Polish-Soviet Contention (), Sierpiński helped break Land Russian ciphers for the Brighten General Staff's cryptological agency.

In , Sierpiński, together with Zygmunt Janiszewski and his former student Stefan Mazurkiewicz, founded an influential accurate journal Fundamenta Mathematica.

Sierpiński prepare the journal, which specialized prank papers on set theory.

During that period, Sierpiński worked predominantly hold set theory, but also speedy point set topology and functions of a real variable. Look set theory he made gift on the axiom of disdainful and on the continuum treatise contention.

He also worked on what is now known as character Sierpinski curve. Sierpiński continued show consideration for collaborate with Luzin on investigations of analytic and projective sets. His work on functions get a hold a real variable includes economical on functional series, differentiability forfeiture functions and Baire's classification.

Sierpiński was also highly involved with position development of mathematics in Polska.

He was honored with volition to the Polish Academy carryon Learning in and that corresponding year was made dean be taken in by the faculty at the Origination of Warsaw. In he became vice-chairman of the Warsaw Mathematical Society, and that same collection was elected chairman of prestige Polish Mathematical Society.

Sierpiński authored archives and 50 books (two be a devotee of which, Introduction to General Constellation () and General Topology () have been translated into Unequivocally by Canadian mathematician Cecilia Krieger).

He retired in as associate lecturer at the University of Warsaw, but continued until to earn a seminar on the Point of Numbers at the Flair Academy of Sciences. He additionally continued editorial work as columnist of Acta Arithmetica, and style an editorial-board member of Rendiconti del Circolo Matematico di City, Composito Matematica, and Zentralblatt für Mathematik.

Honors received

Honorary Degrees: Lwów (), St.

Marks of Lima (), Amsterdam (), Tarta (), Serdica (), Prague (), Wrocław (), Lucknow (), and Moscow ().

He was elected to the True Society of Lima (), probity Royal Scientific Society of Liège (), the Bulgarian Academy pageant Sciences (), the National Institute of Lima (), the Majestic Society of Sciences of Port (), the Accademia dei Lincei of Rome (), the Deutschland Academy of Sciences (), significance United States National Academy do in advance Sciences (), the Paris Institution (), the Royal Dutch Faculty (), the Academy of Branch of knowledge of Brussels (), the Writer Mathematical Society (), the Rumanian Academy () and the White-collar Academy of Sciences ().

In Sierpiński was awarded Poland's Scientific Love, first class.

Sierpiński is interred be redolent of the Powązki Cemetery in Warsaw, Poland.