I sent this to Laura a couple of years ago. It's about Galois connections and metric spaces, more or less. Another way of putting is to say "What is the difference between Saturday and Sunday, really?"
https://drive.google.com/file/d/0B9MgWvi9mywhZkJqTGdfWmlTUThoR1pHV2NfbVQwRGNpN0c4/view?usp=sharing
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