Charles Ehresmann

male, deceased (1979)
mathematician, Alumni of the École Normale Supérieure, French, Bourbaki, Erdős number 4, Category theorist
Charles Ehresmann in 1934 under the supervision of Élie Cartan. In 1957 he founded the mathematical journal "Cahiers de Topologie et Géometrie Di...

Wolfgang Gröbner

male, deceased (1980)
Gossensass, Graz University of Technology, graz, Austrian, mathematics, gottingen…Erdős number 4
Wolfgang Gröbner was an Austrian mathematician. His name is best known for the Gröbner basis, used for computations in algebraic geometry. He was bo...
Titu Andreescu

Titu Andreescu

male, 53 years old (Dallas, Texas, United States)
professor, mathematics, Mathematical Olympiad Program, American Mathematics Competitions, International Mathematical Olympiad, United States of America Mathematical Olympiad…Erdős number 4
Titu Andreescu (born 1956) is an associate professor of mathematics at the University of Texas at Dallas. He is also firmly involved in mathematics...
Florentin Smarandache

Florentin Smarandache

male, 55 years old
University of California, Berkeley, Gallup, Tucson, writer, romanian, Vâlcea…Erdős number 4
Florentin Smarandache is a Romanian-American writer and associate professor of mathematics and science at the University of New Mexico, Gallup, New...
Andreas Floer

Andreas Floer

male, deceased (1991)
mathematician, German, geometry, topology, committed suicide, mathematical physics…Erdős number 4
Andreas Floer was a German mathematician who made important, seminal contributions to the areas of geometry, topology, and mathematical physics. He...
Newton Da da Costa

Newton Da da Costa

male, 80 years old
Logician, Newton Carneiro Affonso da Costa, Topological spaces and continuous functions, Erdős number 4, Curitiba, Universidade Federal do Paraná
Newton Carneiro Affonso da Costa, Professor Emeritus, is a Brazilian mathematician, logician, and philosopher of international reputation. He...
Jean-Louis Koszul

Jean-Louis Koszul

male, 89 years old
mathematician, French, grenoble, mathematics, geometry, French Academy of Sciences…Erdős number 4
Jean-Louis Koszul is a mathematician best known for studying geometry and discovering the Koszul complex. He was educated at the Lycée F...

Penny Smith

female
Lehigh University, Penelope Smith, Millenium problem, quasilinear hyperbolic system, Navier-Stokes existence and smoothness, hyperbolic partial differential equation…Erdős number 4
Penelope Smith is a mathematician at Lehigh University in Bethlehem, Pennsylvania, USA who in 2006 announced a solution to one of the Clay...

José Ádem

male, deceased (1991)
mathematician, Mexican, algebraic topology, veracruz, topologist, Erdős number 4
José Ádem (born in Tuxpan, Veracruz, Mexico, October 27, 1921, died February 14, 1991) was a mathematician who worked in algebraic topology, and di...

Francisco Javier González-Acuña

male
Princeton University, mathematician, Princeton University alumni, Mexican, unam, knot…Erdős number 4
Francisco Javier González-Acuña is a mathematician in the UNAM's institute of mathematics and CIMAT, specializing in low dimensional topology. He di...