Ed Sandifer's
How Euler Did It

Euler as a Teacher - Part 2
February 2010

Euler as a Teacher - Part 1
January 2010

Euler and Gravity
December 2009

Did Euler Prove Cramer's Rule?
November 2009

The Moon and the Differential
September 2009

Bending Light
August 2009

Density of Air
July 2009

Sums of Powers
June 2009

Nearly a Cosine Series
May 2009

Euler and the Pirates
April 2009

Sums That Are Squares
March 2009

Estimating π
February 2009

The Euler Line
January 2009

A Forgotten Fermat Problem
December 2008

Saws and Modeling
November 2008

Curves and Paradox
October 2008

PDEs of Fluids
September 2008

Life and Death-Part 2
August 2008

Life and Death-Part 1
July 2008

A Series of Trigonometric Powers
June 2008

A Product of Secants
May 2008

A Theorem of Newton
April 2008

Rational Trigonometry
March 2008

Fallible Euler
February 2008

Multi-Zeta Functions
January 2008

A False Logarithm Series
December 2007

Inexplicable Functions
November 2007

Gamma the Constant
October 2007

Gamma the Function
September 2007

e, π and i: Why is "Euler" in the Euler Identity?
August 2007

St. Petersburg Paradox
July 2007

Partial Fractions
June 2007

Introduction to Complex Variables
May 2007

Euler and the Hollow Earth: Fact or Fiction?
April 2007

Factoring F5
March 2007

Euler's Greatest Hits
February 2007

Piecewise Functions
January 2007

Cannonball Curves
December 2006

Odd Perfect Numbers
November 2006

How Euler Discovered America
October 2006

Foundations of Calculus
September 2006

Orthogonal matrices
August 2006

Formal Sums and Products
July 2006

Divergent series
June 2006

19th Century Triangle Geometry
May 2006

Knight's Tour
April 2006

Infinitely Many Primes
March 2006

Who Proved e is Irrational?
February 2006

2aa+bb
January 2006

Factors of Forms
December 2005

Amicable Numbers
November 2005

Philip Naudé's problem
October 2005

Bernoulli Numbers
September 2005

A Memorable Example of False Induction
August 2005

Finding logarithms by hand
July 2005

Roots by Recursion
June 2005

The Euler Society
May 2005

Euler and Pell
April 2005

Theorema Arithmeticum
March 2005

Goldbach Series
February 2005

The Euler-Pythagoras Theorem
January 2005

A Mystery About the Laws of Cosines
December 2004

Wallis's Formula
November 2004

Arc Length of an Ellipse
October 2004

Derangements
September 2004

Cramer's Paradox
August 2004

V, E, and F, part 2
July 2004

V, E, and F, part 1
June 2004

Mixed Partial Derivatives
May 2004

Beyond Isosceles Triangles
April 2004

The Basel Problem with Integrals
March 2004

Propulsion of Ships
February 2004

Venn Diagrams
January 2004

Estimating the Basel Problem
December 2003

Fermat's Little Theorem
November 2003