This page is under construction. I plan to add many more items and files which can be downloaded.

- Ideas of Mathematics and Computer (Lecture notes, Labs, Tests), 1–46, (1985)

- (joint work with P.L. Ahlborn),

Topics in Geometry: Inversion, 1–44, (1993) - (joint work with R. Baker and J. Hemmeter),

Problems in Linear Algebra, 1–24, (1992-1995) - Elements of Number Theory: Lecture Notes, 1–36, (1996; Last revision: April 2007)

[pdf] - On a Method in Algebra and Geometry, 1–7, (1991; Last revision: 2003)

[pdf] - On Earth, Moon and Maple, 1–6, (1996). See the modified version of the handout
- On Systems of Linear Diophantine Equations, 1–6, (1996) [pdf]
- (joint work with R. Hochberg),

Invariants I (Discrete Mathematics), 1–6, (1998; Last revision: 2020) [pdf] - (joint work with R. Hochberg),

Invariants II (Geometry), 1–13, (1998). See also Chapter 12 in here. - (joint work with R. Hochberg),

Monovariants, 1–7, (1998; Last revision: February 2011.)[pdf] - Notes and Problem Sets for the Introductory Discrete Mathematics (Math 210),

1–46, (2000) - On Earth, Moon and Maple, 1–6, (1996). Here is an extended version (2011): [pdf]
- On Quadratic Polynomials, 1–9, (1996; Last revision: 9/2008) [pdf]
- (joint work with the class),

Problems and Solutions for Graduate Combinatorics I (Math 688),

1–44, (2000–2006). [pdf] - (joint work with the class),

Problems and Solutions for Graduate Combinatorics II (Math 689),

1–87, (2000). [pdf] (Last revision: Dec 9, 2009.) - Short Proofs of Two Basic Properties of Central Projections. [pdf]

1-10, (2003; Last revision: Jan 7, 2004) - Jensen’s Inequality, [pdf]

1-2, (2000. Last revision: Dec, 2004.)

A better presentation and more examples can be found in Notes on Inequalities, item 24 on this page [pdf] - On a Regular Simplex in R^n, [pdf]

1-2, (2001. Last revision: Dec, 2004.) - “Es steht schon bei Dedekind”, [pdf]

1-8, (2005. Last revision: Oct, 2006.) - (with O. Byer and D. Smeltzer) Methods for Euclidean Geometry, MAA. 451p. 2010.

For selected parts click here. - Linear Algebra II (tentative title), 1-120, (work in progress.)
- Surprises (2014): [pdf]

A longer original version (2013) is here: [pdf] - Arithmetic and Geometric Sequences, [pdf]

1-10, (Last revision: August, 2012.) - Notes on Inequalities, [pdf]

1-28, (Last revision: September 3, 2020.) - On Green-Tao Theorem, [pdf]

1-3, (Last revision: January, 2010.) - Notes on Rational and Real Numbers, [pdf]

1-38, (Last revision: June, 2010.) - Groups of order p^3, [pdf]

1-3, (Last revision: January, 2011.) - (joint work with B. Kronenthal),

When can you factor a quadratic form? (2014) [pdf] - Lectures on Linear Algebra, A Second Course, 1–101, (Based on Fall 2005 M672 Course. Last revision: December 2011.) LecturesLinAlg
- Lectures on Group Theory (with some problems), 1–84, (Revision in process: December 2015.) [pdf]
- Calculus III: Fall 2011 course.
- Simplicity of A_n (Last revision: October 2016.) [pdf]
- Algebra I (Some Lecture Notes): [pdf], and here are some exercises: [pdf]. January 2020.
- What is a good teaching? Who is a better teacher?: [pdf]. Notes for a seminar talk at UD, May 2021.
- Topics Course for Undergraduates: Mathematical Stories: Problems, History, Solutions, Theories. [pdf], October, 2021.
- A Tale of a Happy Marriage: [pdf], Notes for a seminar talk at UD, November, 2021.
- In Elliptic World I: [pdf], Notes for a seminar talk at UD, December, 2021.