Ben Grossmann

United States

(Formerly Omnomnomnom). I received my PhD in mathematics at Drexel University in Philadelphia, PA in 2019. My primary research area is matrix analysis.

Some answers I had fun putting together:

  • An explanation of two's complements
  • Explaining the transcendental numbers
  • A quick linear algebra chestnut
  • A trick I keep reusing
  • Guide to matrix norms
  • Norm minimizing solutions
  • What is homology/cohomology ("for dummies" explanation)
  • What is knot theory (another "for dummies" explanation)

Some of my favorite questions/answers:

  • $\int_{-1}^1\frac1x\sqrt{\frac{1+x}{1-x}}\ln\left(\frac{2\,x^2+2\,x+1}{2\,x^2-2\,x+1}\right)\ \mathrm dx$; a feat of mathematical wizardry
  • A classic result from different approaches
  • Apparent patterns that eventually fail
  • Bad math that gets away with it; great for a few good laughs
  • Some great math puzzles

Useful links:

  • Non-symmetric PD matrices,
  • MathJax tutorial and quick-reference
  • How to ask a good question
  • MSE Blog
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