# Categories

- A
- Algebraic Curves and Surfaces
- B
- Combinatorical Geometry
- I
- Configurations
- II
- Regular bodies und crystals
- III
- Isometry groups
- IV
- Polyhedrons
- V
- 4-dimensional regular configurations
- XX
- Others
- Slide: Pictures of iron constructions
- Slide: Pictures of iron constructions
- Slide: Müngsten bridge
- Slide: Spree bridge in Berlin
- Slide: Bridge in Alaska
- Slide: Overpass
- Slide: Rhine bridge in Bonn
- Slide: Picture of iron constructions
- Slide: Ship lift
- Slide: Ship lift
- Slide: Ship lift
- Slide: Ship lift
- Slide: Ship lift
- Slide: Steam crane
- Slide: Pictures of iron constructions
- Slide: Pictures of iron constructions
- Slide: Pictures of iron constructions
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation
- Slide: Mechachnical relations in case of an area deformation

- C
- Topology
- D
- Kinematics and Mechanics
- E
- Differential Geometry
- F
- Algebra
- G
- Analysis, Probability Theory
- H
- Theory of Functions of Complex Variables
- J
- Differential Equations, Wave Theory
- K
- Geometrical Optics
- L
- Instruments and Devices.
- M
- History of Mathematis and Astronomy
- Z
- Other