BIMI221

4. Showed the existence of invariants in ternary cubics
6. One of the initiators of intuitionism
7. Her Doctoral Advisor was W. Hurewicz
9. Wrote with H. Cartan the first book on Homological Algebra
11. Gives name to the Memorial Problem Bookpublished by the AMS in 1957
14. Developed a method to obtain approximated roots of algebraic equations of arbitrary order
17. Pen name of Eric Temple Bell
18. Invented the Intergraph in 1878
20. Doscovered the sponge that is usually attributed to Sierpinski

1. Axiomatized Set Theory in 1908
2. Authors of the famous "Aperçu historique" in 1837
3. Found invariants of knots and links by algebraic methods
5. Author of "Treatise of Some New Geometric Methods"
8. Discovered the rectification of a cycloidal arc
10. Showed that any prime defines a particular topology for the field of rational numbers
12. Teacher of K. Weierstrass
13. Shared the Steiner Prize with Sturm (1866)
15. Gave a first (incomplete) proof the impossibility of solving 5-order equations by radicals in 1789
16. Gives name to an important class of groups
19. Influential historian on Group Theory