Bialgebroids, times_(A)-bialgebras and duality
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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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