Math-4

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Across
  1. 2. Famous prediction of Halley's Comet in 1759
  2. 10. Wrote "Geometria indivisibilibus continuorum" in 1635
  3. 11. Author of monumental "Traité des substitutions"
  4. 12. Gives name to a matrix decomposition
  5. 14. Wrote "Dimension Theory" in 1941
  6. 17. Gives name to rule in determinant theory
  7. 19. Gives name to an indicatrix
  8. 20. Known expert in graph theory
Down
  1. 1. Improved the logical system of Frege
  2. 3. Introduced parallel transport in Riemannian manifolds
  3. 4. Gives name to an important projection of the sphere
  4. 5. Gives name to a relevant class of numbers
  5. 6. Gives name to a fourth-order class three surface
  6. 7. Generalized the Lebesgue integral
  7. 8. Famous for binational transformations
  8. 9. Systematized descriptive geometry
  9. 13. Discovered "ideal complex numbers"
  10. 15. Pioneer in the study of nilpotent Lie groups
  11. 16. Gave name to the Luzitania group in the 1920s
  12. 18. Studied probability in chains