54Exx Spaces with richer structures

• 54E05 Proximity structures and generalizations
• 54E15 Uniform structures and generalizations
• 54E17 Nearness spaces
• 54E18 $p$-spaces, $M$-spaces, $sigma$-spaces, etc.
• 54E20 Stratifiable spaces, cosmic spaces, etc.
• 54E25 Semimetric spaces
• 54E30 Moore spaces
• 54E35 Metric spaces, metrizability
• 54E40 Special maps on metric spaces
• 54E45 Compact (locally compact) metric spaces
• 54E50 Complete metric spaces
• 54E52 Baire category, Baire spaces
• 54E55 Bitopologies
• 54E70 Probabilistic metric spaces
• 54E99 None of the above but in this section