Displaying similar documents to “On ramifications divisors of functions in a punctured compact Riemann surface.”

A Nakai-Moishezon criterion for non-Kähler surfaces

Nicholas Buchdahl (2000)

Annales de l'institut Fourier

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A version of the classical Nakai-Moishezon criterion is proved for all compact complex surfaces, regardless of the parity of the first Betti number.

The range of the sum-of-proper-divisors function

Florian Luca, Carl Pomerance (2015)

Acta Arithmetica

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Answering a question of Erdős, we show that a positive proportion of even numbers are in the form s(n), where s(n) = σ(n) - n, the sum of proper divisors of n.

On del Pezzo fibrations

Massimiliano Mella (1999)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

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