High Quality Content by WIKIPEDIA articles! Wac aw Franciszek Sierpi skov (Russian: vatswaf fra t i k r p i sk i) (March 14, 1882, Moscow October 21, 1969, Warsaw) was a Polish-Russian mathematician. He was known for outstanding contributions to set theory (research on the axiom of choice and the continuum hypothesis), number theory, theory of functions and topology. He published over 700 papers and 50 books. Three well-known fractals are named after him (the Sierpinski triangle, the Sierpinski carpet and the Sierpinski curve), as are Sierpinski numbers and the associated Sierpi ski problem.