Research output: Contribution to journal › Article

Journal | Mathematical Proceedings of the Cambridge Philosophical Society |
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Date | Published - Jan 1995 |

Issue number | 1 |

Volume | 117 |

Number of pages | 25 |

Pages (from-to) | 31-55 |

Original language | English |

In important work some thirty years ago, G. Birkhoff[2, 3] and E. Hopf [16, 17] showed that large classes of positive linear operators behave like contraction mappings with respect to certain ‘almost’ metrics. Hopf worked in a space of measurable functions and took as his ‘almost’ metric the oscillation ¿(y/x) of functions y and x with x(t) > 0 almost everywhere, defined by...

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