An ode to joy at the end: algebraic topology backwards Spaces define the new number theory |
How many goodly creatures are there here! How beautious mankind is! O brave new world, That has such people in't!" Miranda in The Tempest. W. Shakespeare |
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1. Extensions of number systems 2. Negative numbers 3. Briefly on sheep |
4. A trade deficit 5. Out in space 6. Ulla and Henriette live in RP∞ |
7. Negative sets 8. The sphere spectrum 9. Brave New World |