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## 4. The Schubert Calculus

The classical Schubert calculus of enumerative geometry is concerned with
questions of enumerating linear subspaces of a vector space or projective
space that satisfy incidence conditions imposed by other linear subspaces.
3. Enumerative Real Algebraic Geometry

- 4.i. The Schubert Calculus of Lines
- 4.ii The Special Schubert Calculus
- 4.iii Further Extensions of the Schubert Calculus

5. The Conjecture of Shapiro and Shapiro

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