Nathalie Wahl

Nathalie Wahl (born 1976)[1] is a Belgian mathematician specializing in topology, including algebraic topology, homotopy theory, and geometric topology. She is a professor of mathematics at the University of Copenhagen, where she directs the Copenhagen Center for Geometry and Topology.

Education and career

Wahl was born in Brussels, and earned a license in mathematics in 1998 at the Université libre de Bruxelles, advised by Jean-Paul Doignon. Her undergraduate thesis concerned infinite antimatroids, and she published the same material in 2001 as her first journal paper.[1] She completed a Ph.D. at the University of Oxford in 2001, with a dissertation Ribbon Graphs and Related Operads in algebraic topology supervised by Ulrike Tillmann.[2]

After short-term positions at Northwestern University, Aarhus University, and the University of Chicago, she joined the Department of Mathematical Sciences at the University of Copenhagen in 2006, and was promoted to full professor there in 2010.[1] In 2020 she became Center Leader of the Copenhagen Center for Geometry and Topology.[1][3]

Recognition

In 2008, Wahl won the Young Elite Researcher Award (Ung Eliteforskerprisen) of the Independent Research Fund Denmark (Danmarks Frie Forskningsfond).[1][4] In 2016, she was elected to the Danish Academy of Natural Sciences.[1][5]

gollark: By multiplying two smallish prime numbers (inaccessible to the user except via the debug API, if it was available in potatOS (it's not, fully)) to make a bigger *semi*prime it's possible to make a problem easy to generate but relatively hard to solve.
gollark: It's actually very fast.
gollark: ```lualocal function isprime(n) for i = 2, math.sqrt(n) do if n % i == 0 then return false end end return trueend local function findprime(from) local i = from while true do if isprime(i) then return i end i = i + 1 endend```
gollark: ```lua if settings.get "potatOS.removable" then potatOS.actually_really_uninstall = function(hedgehog) if hedgehog == "76fde5717a89e332513d4f1e5b36f6cb" then print "Hedgehog valid. Deleting potatOS main code." fs.delete "/autorun" else error "Invalid hedgehog! Expected 76fde5717a89e332513d4f1e5b36f6cb." end end end```Also this bit, optionally.
gollark: ```lua begin_uninstall_process = function() print "Please wait. Generating semiprime number..." local p1 = findprime(math.random(2, 100000)) local p2 = findprime(math.random(2, 100000)) local num = p1 * p2 print("Please find the prime factors of the following number:", num) write "Factor 1: " local f1 = tonumber(read()) write "Factor 2: " local f2 = tonumber(read()) if (f1 == p1 and f2 == p2) or (f2 == p1 and f1 == p2) then term.clear() term.setCursorPos(1, 1) print "Accepted. Moving startup." fs.delete "old-potatOS-startup" fs.move("startup", "old-potatOS-startup") print "Press any key to continue." os.pullEvent "key" os.reboot() else print("Factors", f1, f2, "invalid.", p1, p2, "expected.") end end```This bit is the uninstaller.

References
  1. Curriculum vitae (PDF), retrieved 2020-02-06
  2. Nathalie Wahl at the Mathematics Genealogy Project
  3. World leading mathematicians to solve mysteries at the interface of geometry and topology, Copenhagen Department of Mathematical Sciences, 23 October 2019, retrieved 2020-02-06
  4. Nathalie Wahl (interview) (in Danish), Independent Research Fund Denmark, 2009
  5. "Medlemmer af DNA" (PDF), Årsberetning for Danmarks Naturvidenskabelige Akademi (in Danish), pp. 29–45, 2018
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