Modular multiplicative inverse

In the mathematical field of complex analysis, the Bloch space, named after André Bloch and denoted $\mathcal{ℬ}$ or ℬ, is the space of holomorphic functions f defined on the open unit disc D in the complex plane, such that the function

$(1-|z{|}^2)|f^{\prime }(z)|$

is bounded. $\mathcal{ℬ}$ is a Banach space, with the norm defined by

$\Vert f{\Vert }_{\mathcal{ℬ}}=|f(0)|+{\sup }_{z\in \mathbf{D}}(1-|z{|}^2)|f^{\prime }(z)|.$

This is referred to as the Bloch norm and the elements of the Bloch space are called Bloch functions.

Notes

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