- MathNotebook
- MathConcepts
- StudyMath
- Geometry
- Logic
- Bott periodicity
- CategoryTheory
- FieldWithOneElement
- MathDiscovery
- Math Connections
Epistemology
- m a t h 4 w i s d o m - g m a i l
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- My work is in the Public Domain for all to share freely.
- 读物 书 影片 维基百科
Introduction E9F5FC
Questions FFFFC0
Software
See: Math Notebook
对偶
Investigation: Explore how duality is broken by comparing a category and its opposite category?
- What are categories related to logic?
- What are examples in math where a category is isomorphic to its opposite category?
- When is a category actually equal (not merely isomorphic) to its opposite category?
Examples to study:
- Set (and the tiniest versions)
- Top (and the tiniest versions)