- 
One side/both sides
 - 
retrogression
 - 
CAPUS
 - 
Augusto Moebius.
- Famous for the Mobius Circle
 - Map
 
 - 
Felix Klein.
- Famous for the Klein Vase
 - Erlangen Program
- Geometry is the study of properties of spaces such that they are invariant under the action of transformation groups
 - Conversion” extended beyond joint conversions.
 
 
 
p.50
- Reversal against unit yen
 - Add an infinity point to the complex plane → Riemann sphere 1854
 
p.213
- Tiles produced by two Möbius transformations and limit set
- Schottky circle
 - Four paired circles
- Transfer the inside of one to the outside of the other.
 
 - pseudofuchs group
 
 
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