Institute of Mathematics AS CR, v. v. i.
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    Transfer of derived equivalences from subalgebras to endomorphism algebras II

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    summary:We investigate derived equivalences between subalgebras of some Φ\Phi -Auslander-Yoneda algebras from a class of nn-angles in weakly nn-angulated categories. The derived equivalences are obtained by transferring subalgebras induced by nn-angles to endomorphism algebras induced by approximation sequences. Then we extend our constructions in T. Brüstle, S. Y. Pan (2016) to nn-angle cases. Finally, we give an explicit example to illustrate our result

    Hall algebra of morphism category

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    summary:This paper investigates a universal PBW-basis and a minimal set of generators for the Hall algebra H(C2(P))\mathcal {H}(C_2(\mathcal {P})), where C2(P)C_2(\mathcal {P}) is the category of morphisms between projective objects in a finitary hereditary exact category A\mathcal A. When A\mathcal A is the representation category of a Dynkin quiver, we develop multiplication formulas for the degenerate Hall Lie algebra L\mathcal {L}, which is spanned by isoclasses of indecomposable objects in C2(P)C_2(\mathcal {P}). As applications, we demonstrate that L\mathcal {L} contains a Lie subalgebra isomorphic to the central extension of the Heisenberg Lie algebra and construct the Borel subalgebra of the simple Lie algebra associated with A\mathcal A as a Lie subquotient algebra of L\mathcal {L}

    Ancestors and extended family of Josef Vojtěch Sedláček

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    [Cover]

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    Některá využití harmonického průměru ve výuce fyziky a ve finančnictví a ekonomii

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    summary:Článek navazuje na publikovaný příspěvek o harmonickém průměru a rozšiřuje jej o další aplikace harmonického průměru. Tentokráte se autoři zaměřili na využití harmonického průměru při řešení středoškolských úloh z fyziky a v oblasti finančnictví a v ekonomii. Širokou paletou praktických početních úloh je doloženo specifické a praktické využití harmonického průměru

    Ancestors and extended family of Josef František Smetana

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    Smetana's grave, monument and memorial plaque

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    [Front matter]

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    Later copies of Sedláček's works. Unfound Work

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    Marking the 60th Anniversary of Kybernetika

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    Institute of Mathematics AS CR, v. v. i.
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