nLab upper half-plane

Redirected from "Cartier dual".
Note: Cartier duality and group scheme both redirect for "Cartier dual".
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Idea

The part of the complex plane of positive imaginary part is often called the upper half plane, sometimes denoted \mathfrak{H}.

Accodingly the lower half plane is the subset of complex numbers with negative imaginary part.

References

Last revised on July 23, 2023 at 01:54:15. See the history of this page for a list of all contributions to it.