# Hokkaido Mathematical Journal

## Hokkaido Mathematical Journal, 35 (2006) pp.487-495

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### Abstract

In this paper, we shall consider the class $N^p(D)(p>1)$ of holomorphic functions on the upper half plane $D:=\{ z \in {\bf C} \, | \, \verb|Im| z > 0 \}$ satisfying $\displaystyle \sup_{y>0} \int_{\bf R} \Bigl( \log (1+|f(x+iy)|) \Bigr)^p \,dx < \infty$. We shall prove that $N^p(D)$ is an $F$-algebra with respect to a natural metric on $N^p(D)$. Moreover, a canonical factorization theorem for $N^p(D)$ will be given.

MSC(Primary) 46E10 30H05 Nevanlinna-type spaces, Nevanlinna class, Smirnov class, $N^p$, Hardy spaces