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The structure of weak coalgebra-Galois extensions

Tomasz Brzezinski·Ryan B. Turner·Adam P. Wrightson
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Abstract

Weak coalgebra-Galois extensions are studied. A notion of an invertible weak entwining structure is introduced. It is proven that, within an invertible weak entwining structure, the surjectivity of the canonical map implies bijectivity provided the structure coalgebra C is either coseparable or projective as a C-comodule.

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Tomasz Brzezinski, Ryan B. Turner, Adam P. Wrightson. 2004-11-10. The structure of weak coalgebra-Galois extensions. https://arxiv.org/abs/math/0411230

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