61 research outputs found

    Algebraic characteristic classes for idempotent matrices

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    This paper contains the algebraic analog for idempotent matrices of the Chern-Weil theory of characteristic classes. This is used to show, algebraically, that the canonical line bundle on the complex projective space is not stably trivial. Also a theorem is proved saying that for any smooth manifold there is a canonical epimorphism from the even dimensional algebraic de Rham cohomology of its algebra of smooth functions onto the standard even dimensional de Rham cohomology of the manifold

    Bioklimatische Bedeutung Potentieller Aerosole

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    Entnahmeapparatur für chemisch-klimatologische und technische Luftuntersuchungen

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    �ber den Nachweis erh�hter Radioaktivit�t in Aerosolkondensaten

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    �ber das Vorkommen molybdataktiver Kiesels�ure in nat�rlichen Aerosolen

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    Bestimmung des Jodes der Luft

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    Verfahren zur chemischen Analyse der Nebelkerne der Luft

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