#### UM Math Graduate Students Seminar

Yijia Liu
University of Miami

will present

#### Almost Complex Structures

Friday, April 20, 2012, 4:00pm
Ungar Building Room 402

Abstract: The existence of a complex structure has a central role in many physical problems. But sometimes it can be quite difficult to determine whether a manifold admits a complex structure. An example in this respect is the six dimensional sphere $$S^6$$. In this talk, I will introduce the notion of almost complex structure and its relation to complex structure. An interesting result is that the only almost complex spheres are $$S^2$$ and $$S^6$$. I will give a criteria (Wu's Theorem) for 4-manifolds and show that $$S^4$$ does not admit an almost complex structure.

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