By Anderson D.R., Munkholm H.J.

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**Extra info for Boundedly Controlled Topology: Foundations of Algebraic Topology and Simple Homotopy Theory**

**Example text**

Use this construction to show that there is a unique mapping of any triple of distinct points (x1 , x2 , x3 ) to any other triple of distinct points (x1 , x2 , x3 ). 10. The real projective space R P n is the space of all straight lines through the origin in R n+1 . The group S L(n + 1; R) maps x = (x1 , x2 , . . , xn+1 ) ∈ R n+1 to x ∈ R n+1 , with x = 0 ↔ x = 0 and x = 0 ↔ x = 0. A straight line through the origin contains x = 0 and y = 0 if (and only if) y = λx for some real scale factor λ = 0.

I. If b and b are not colinear, k(b )k(b) = k(b )h(θ ). Compute b , θ. The angle θ is related to the Thomas precession (Gilmore 1974b). 8. The circumference of the unit circle is mapped into itself under the transformation θ → θ = θ + k + f (θ), where k is a real number, 0 ≤ k < 2π , and f (θ) is periodic, f (θ + 2π ) = f (θ). The mapping must be 1:1, so an additional condition is imposed on f (θ ): d f (θ )/dθ > −1 everywhere. Does this set of transformations form a group? What are the properties of this group?

The symmetric matrix is parameterized by a two-dimensional manifold, the two-sheeted hyperboloid z 2 − x 2 − y 2 = 1. The rotation matrix is parameterized by a point on a circle. Two points (x, y, |z|, θ) and (−x, −y, −|z|, θ + π) map to the same matrix in S L(2; R). The manifold that parameterizes S L(2; R) is three dimensional. It is H 2+ × S 1 , where H 2+ is the upper sheet of the two-sheeted hyperboloid. 4 Unexpected simplification Almost every Lie group that we will encounter is either a matrix group or else equivalent to a matrix group.

### Boundedly Controlled Topology: Foundations of Algebraic Topology and Simple Homotopy Theory by Anderson D.R., Munkholm H.J.

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