Midpoints and Bisectors - Universal Hyperbolic Geometry

Explore the concepts of midpoints and bisectors in hyperbolic geometry in this comprehensive lecture from the Universal Hyperbolic Geometry series. Learn how reflections, defined by 2x2 trace zero matrices, play a crucial role in understanding midpoints and bisectors. Discover the unique properties of hyperbolic geometry, including the existence of two midpoints for a side and the special case of null point reflections. Examine key theorems on matrix perpendicularity and how reflections preserve both perpendicularity and lines. Follow along with geometrical constructions of midpoints using a straightedge and understand the differences between Euclidean and hyperbolic geometry in terms of side and vertex midpoints and bisectors. Gain valuable insights into this fascinating area of mathematics through clear explanations and visual demonstrations.

Introduction
Definition of reflection of a general point
Null reflection theorem
Matrix perpendicularity theorem
Reflection preserves perpendicularity theorem
Reflection preserves lines theorem
Midpoint between 2 points
Geometrical construction of midpoints 1a
Geometrical construction of midpoints 1b
Geometrical construction of midpoints 2
Not all sides have midpoints; side/vertex midpoints/bisectors