Al-burcas

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Name	Al-burcas
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Seen	Jan 31 at 22:31
Website	home.uevora.pt/~rpa
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Least number of charts to describe a given manifold

Is there a complex structure on the 6-sphere?

Lie groups admitting flat (bi)invariant metrics.

What makes four dimensions special?

An example of a complex manifold without a finite open cover

Origin of terms “flag”, “flag manifold”, “flag variety”?

How are multiplicative sequences related to formal power series and genera of manifolds?

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dg.differential-geometry× 4
complex-geometry× 3
at.algebraic-topology× 2
terminology
soft-question
smooth-manifolds
open-problem
lie-groups
ho.history-overview
gt.geometric-topology

gr.group-theory
gn.general-topology
differential-topology
cohomology
characteristic-classes
big-picture
big-list
algebraic-groups
ag.algebraic-geometry

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