Index Analysis pp 113-148 | Cite as

# Approach Invariants

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## Abstract

In view of the fact that approach spaces generalize at the same time topological spaces and metric spaces, there will be approach properties or invariants which are more of a topological nature while others are more of a metric nature. We do not systematically generalize all possible concepts in topological and metric spaces to the setting of approach spaces but concentrate ourselves on those concepts which demonstrate some interesting aspects, appear to live naturally in the realm of approach theory or which are required, in particular, for the applications later on.

## Copyright information

© Springer-Verlag London 2015