Take the 2-minute tour ×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.

Suppose $f : X \to Y$ is birational morphism of smooth projective varieties. Is true that $N^1(X) = f^\ast N^1(Y) \oplus \bigoplus \mathbb R \cdot [E_i]$, with $E_i$ ranges over exceptional divisors?

share|improve this question

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.