Math 465: Foundations of Geometry

Math 584: Euclidean and Non-Euclidean Geometry

Information Page, Fall 2019


I will finish grading by Wednesday night. I will be in my office on Thursday, 12-1 and Friday, 11.15-12.30 pm. Come by to see your final. Or e-mail me to get your score and final grade.



A short biography of Euclid and Euclid

Here is a short note about Euclid and his "Elements".


Here are numerous proofs of the Pythagorean Theorem.


Here is a discussion of Ptolemy's theorem.

Here is a "proof" that all triangles are equilateral.


Nine point circle

Here are some properties of the nine-point circle.

Here and here you will find a discussion of the orthic traingle and its properties.


Here is a proof of the Simson's line theorem, and here is a discussion of the Simson line.

Here and here is a discussion of Miquel point.

Here is a nice visualization of Miquel point (you need to use mozilla browser and have updated Java).

Here is a proof of Miguel point theorem (Pivot theorem) and also several properties of the Simson line.

Here is a discussion of Menealus's Theorem, with several proofs and additional topics


Here is a nice article about finite geometries.

Here is a short discussion of affine and projective planes.


Here are solutions to the test.


Here is a discussion of the Wallace-Gerwien-Bolyai Theorem. Here is a discussion of an analogous problem in three dimensions (often called Hilbert's third problem).


Here is a nice discussion of inversion. See various links at the bottom which all show various applications of inversions. In particular, read the one about Apollonian circles theorem, which is related to problem 39.10.

Here is another place where many interesting results related to inversion are discussed.

Here is a short discussion of inversion with many references.


Here is a discussion and visualization of hyperbolic geometry.


Outline for review

Here is an overview of Hilbert's axioms.


Assignments

Assigments must be written carefully. You are allowed (even encouraged) to discuss the assigments with other students but you have to write the solutions on your own. Identical solutions will not be graded. If your solutions are not written clearly, they will not be graded and you will receive no credit.