Math

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Across
  1. 3. worked himself blind (last name)
  2. 5. last found in a duel space
  3. 7. an integer with infinitely many divisors
  4. 8. closure is everything
  5. 9. 17 and 19, 29 and 31
  6. 11. commutes with its conjugate, or contains all conjugates, or invariant under conjugation, or ...
  7. 13. Gauss's Theorema Egregium says something about this
  8. 14. famously transcendental
  9. 15. Riemann vs Lebesgue
Down
  1. 1. different before, different after
  2. 2. f(z)=z^n has n of these at infinity
  3. 4. every vector space has one, given the choice
  4. 6. "a ___ of truth", in a vector space
  5. 9. finiteness in a group
  6. 10. a (nonempty) graph has at least one
  7. 12. this group counts holes, sort of