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arxiv: math/0012164 · v2 · submitted 2000-12-18 · 🧮 math.QA · math.RA

Bialgebroids, times_(A)-bialgebras and duality

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keywords bialgebroidsbialgebrasbicoalgebroidtimesalgebraanchorbialgebroidclass
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An equivalence between Lu's bialgebroids, Xu's bialgebroids with an anchor and Takeuchi's $\times_{A}$-bialgebras is explicitly proven. A new class of examples of bialgebroids is constructed. A (formal) dual of a bialgebroid, termed bicoalgebroid, is defined. A weak Hopf algebra is shown to be an example of such a bicoalgebroid.

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