
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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September 20th, 2019, 10:28 AM  #1 
Senior Member Joined: Oct 2013 From: Far far away Posts: 431 Thanks: 18  Max Dehn
How important is Max Dehn (1878 to 1952) to knot theory?

September 20th, 2019, 01:32 PM  #2 
Senior Member Joined: Aug 2012 Posts: 2,412 Thanks: 755 
He's invariant.
