MATH 308 Fall 2011 Lecture Summary


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Date Contents
1 0905
Labour Day
0907 outline, Euclidean geometry, overview and examples (Ceva and Pascal theorems, Apollonian circles, angular excess on sphere, angular defect on Poincare disk) L1
0909 Chapter 1. Conic sections
§1.1.1 Conics
§1.1.3 Focus-directrix definition of non-degenerate conics
L2
2 0912 §1.1.4 focal distance properties
§1.1.5 conic sections are conics, proof by Dandelin sphere
L3
0914 §1.2.1 tangent lines
§1.2.2 reflection properties of conic mirrors
L4
0916 §1.2.2 continue
§1.3   examples that quadratic curves are conics
L5
3 0919 §1.3   writing a quadratic equation in standard form
L67
0921 §1.3   finding the axes and vertices of a quadratic equation
L67
0923 Section 2.1 Euclidean geometry
§2.1.1 What is Euclidean geometry? isometries, rotations
L8
4 0926 §2.1.1 reflections, Euclidean transformations; group L9
0928 §2.1.1 examples of group properties of Euclidean transformations
§2.1.2 Euclidean congruence
Chapter 2. Affine geometry
§2.2.1 affine transformations
L10
0930
§2.2.1 affine properties and affine geometry
§2.2.2 parallel projections
L11
5 1003
§2.2.2 a parallel projection preserves lines, parallel lines, and ratio of length along same direction
§2.2.3 a parallel projection is an affine transformation; any affine transformation is a composition of two parallel projections
L12
1005
MT1

1007
§2.2.3 application to conjugate diameters of ellipses
§2.3.1 finding the equation of the image of a line under an affine transformation
L13
6 1010
Thanksgiving

1012
§2.3.2 Fundamental Theorem of affine geometry
§2.3.3 algebraic proof of basic affine properties; signed ratio
L14
1014
§2.3.3 more on signed ratio
§2.4.2 Ceva's theorem
L15
7 1017
§2.4.3 Menelaus' theorem and example
L16
1019
§2.5.1 conics have exactly 3 equivalent classes
§2.5.2 examples of affine properties of conics
L17
1021
§2.5.2 more examples
Chapter 5. inversive geometry: overview
§5.1 inversions
L18
8 1024
Formula for inversion, images of lines and circles, a generalized circle is mapped to a generalized circle
L19
1026
angles and parallel lines under inversion
L20
1028
§5.2 review complex plane; isometries on complex plane: notation, as compositions of reflections
L21
9 1031
scaling, inversion, linear and reciprocal functions, extended complex plane, stereographic projection
L22
1102
stereographic projection preserves circles and magnitude of angles
§5.3 Inversive transformations, properties, and geometry. Moebius transformation.
L23
1104
composition and inverse of Moebius transformations, associated matrices, the Moebius group, an inversive transformation is either M(z) or M(\bar z)
L24
10 1107
§5.4 Fundamental theorem of inversive geometry
L25
1109
MT2

1111
Remembrance Day
11 1114
how to decide whether 4 points belong to the same circle
§5.5 Coaxal families of cirlces. Appolonian circles, algebraic proof.
L26
1116
geometric proof, Coaxal circles theorem, relation between inverse points and Appolonian circles
L27
1118
continue the proof of the lemma. Inverse points are preserved under inversive transformations. Concentricity theorem. Note we skip §5.5.4
L28
12 1121
Chapter 6. Non-Euclidean Geometry.
Recall Euclidean Geometry.
§6.1 Poincare disk, d-points and d-lines.
L29
1123
Non-Euclidean reflections and transformations, Origin Lemma, Axiom 5
L30
1125
more examples
§6.2 formula of Non-Euclidean transformations
§6.3 distance function
L31
13
1128
§6.3 distance function continued, midpoint, circle
L32
1130
A non-Euclidean circle is a Euclidean circle in D
examples of uncovered results
L33
1202
review


1208
Final Exam