# Topology movies

Topics in topology

## Galleries :

 The Klein bottleConstruction of a Klein bottle by joining the edges of a rectangle.Added on 2016-02-16
 Moebius-KleinTwo Moebius strips make a Klein bottleAdded on 2016-02-16
 The figure 8 Klein bottleThe less-known form of the Klein bottle...Added on 2016-02-16
 Multiple Klein bottlesLinked Klein bottles. Note that the number of "bottles" needs to be uneven in order to have a non-orientable surface.Added on 2016-02-16
 From an octagon to a genus 2 surface An octagon can be bent into a genus two surface (a surface with two holes) by joining the sides with the same colour..Added on 2016-02-16
 From a 16-gon to a genus 4 surface A polygon with 16 sides can be formed into a genus 4 surface, a surface with 4 holes.Added on 2016-02-16
 From a 40-gon to a genus 10 surface. A polygon with 40 edges can be bent into a genus 10 surface (a surface with 10 holes).Added on 2016-02-16
 The real projective plane and the Moebius stripThe real projective plane minus a disc is a Moebius strip.Added on 2016-02-18
 The cross-cap.The construction of the cross-cap.Added on 2016-02-17
 The Boy surfaceThe construction of a Boy surface.Added on 2016-02-17
 Moebius strip and cross-capVisual proof that a Moebius strip is homeomorphic to a cross-cap with a disc removed.Added on 2016-03-01
 The Klein Quartic IIThe transition from a hyperbolic 14-gon to a genus 3 surface, while preserving the tiling by 24 heptagons.Added on 2016-02-16
 Connected sum of two real projective planesVisual proof that the connected sum of two real projective planes is a Klein bottle.Added on 2016-02-18
 Connected sums of real projective plane and torus or Klein bottle.Visual proof that the connected sum of a real projective plane and a torus , and the connected sum of a real projective plane and a Klein bottle are homeomorphic. Added on 2016-02-20
 Dodecahedral tesselation of the hypersphereA dissection of the 120 cell in twelve rings of 10 dodecahedra. Two sets of six rings form 2 solid interlocked tori. The film starts by showing the 600 cell, the dual of the 120 cell.Added on 2016-02-21
 The Klein Quartic IHow this hyperbolic tiling can be folded into a genus 3 surface.Added on 2016-02-16

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