## Carl B. Allendoerfer Awards

For expository articles published in *Mathematics Magazine*.

#### 2019

William Dunham

The Early (and Peculiar) History of the Möbius Function

*Mathematics Magazine*, Vol. 91, no. 2, March 2018, pp. 83–91.

Jordan Bell and Viktor Blåsjö

Pietro Mengoli’s 1650 Proof that the Harmonic Series Diverges

*Mathematics Magazine*, Vol. 91, no. 5, December 2018, pp. 341–347.

#### 2013

Khristo N. Boyadzhiev

Close Encounters with the Stirling Numbers of the Second Kind

*Mathematics Magazine*, Vol. 85, no. 4, October 2012, pp. 252–266.

Adrian Rice and Ezra (Bud) Brown

Why Ellipses Are Not Elliptic Curves

*Mathematics Magazine*, Vol. 85, no. 3, June 2012, pp. 163–176.

#### 2010

Ezra (Bud) Brown and Keith Mellinger

Kirkman's Schoolgirls Wearing Hats and Walking Through Fields of Numbers

*Mathematics Magazine*, Vol. 82, no. 1, February 2009, pp. 3–15.

#### 2009

Jeff Suzuki

A Brief History of Impossibility

*Mathematics Magazine*, Vol. 81, no. 1, February 2008, pp. 27–38.

#### 2008

Chris Christensen

Polish Mathematicians Finding Patterns in Enigma Messages

*Mathematics Magazine*, Vol. 80, no. 4 (2007), pp. 247–273.

#### 2007

Saul Stahl

The Evolution of the Normal Distribution

*Mathematics Magazine*, Vol. 79, no. 2 (2006), pp. 96–113.

#### 2006

Jeff Suzuki

The Lost Calculus (1637–1670): Tangency and Optimization without Limits

*Mathematics Magazine*, Vol. 78, no. 5 (2005), pp. 339–353.

#### 2002

Mark McKinzie and Curtis Tuckey

Higher Trigonometry, Hyperreal Numbers, and Euler's Analysis of Infinities

*Mathematics Magazine*, Vol. 74, no. 5 (2001), pp. 339–368.

#### 2000

Donald Teets and Karen Whitehead

The Discovery of Ceres: How Gauss Became Famous

*Mathematics Magazine*, Vol. 72, no. 2 (1999), pp. 83–91.

#### 1996

Judith Grabiner

Descartes and Problem-Solving

*Mathematics Magazine*, Vol. 68, no. 2 (1995), pp. 83–97.

#### 1995

Lee Badger

Lazzarini's Lucky Approximation of π

*Mathematics Magazine*, Vol. 67, no. 2 (1994), pp. 83–91.

#### 1992

Israel Kleiner

Rigor and Proof in Mathematics: A Historical Perspective

*Mathematics Magazine*, Vol. 64, no. 5 (1991), pp. 291–314.

#### 1991

Ranjan Roy

The Discovery of the Series Formula for π by Leibniz, Gregory, and Nilakantha

*Mathematics Magazine*, Vol. 63, no. 5 (1990), pp. 291–306.

#### 1990

Thomas Archibald

Connectivity and Smoke-Rings: Green's Second Identity in Its First Fifty Years

*Mathematics Magazine*, Vol. 62, no. 4 (1989), pp. 219–232.

#### 1989

Judith V. Grabiner

The Centrality of Mathematics in the History of Western Thought

*Mathematics Magazine*, Vol. 61, no. 4 (1988), pp. 220–230.

#### 1987

Israel Kleiner

The Evolution of Group Theory: A Brief Survey

*Mathematics Magazine*, Vol. 59, no. 4 (1986), pp. 195–215.

#### 1986

Saul Stahl

The Other Map Coloring Theorem

*Mathematics Magazine*, Vol. 58, no. 3 (1985), pp. 131–145.

#### 1984

Judith V. Grabiner

The Changing Concept of Change: The Derivative from Fermat to Weierstrass

*Mathematics Magazine*, Vol. 56, no. 4 (1983), pp. 195–206.

#### 1980

Ernst Snapper

The Three Crises in Mathematics: Logicism, Intuitionism, and Formalism

*Mathematics Magazine*, Vol. 52, no. 4 (1979), pp. 207–216.

#### 1979

Bruce C. Berndt

Ramanujan's Notebooks

*Mathematics Magazine*, Vol. 51, no. 3 (1978), pp. 147–164.

#### 1978

David A. Smith

Human Population Growth: Stability or Explosion?

*Mathematics Magazine*, Vol. 50, no. 4 (1977), pp. 186–197.

#### 1977

Joseph A. Gallian

The Search for Finite Simple Groups

*Mathematics Magazine*, Vol. 49, no. 4 (1976), pp. 163–180.

B.L. van der Waerden

Hamilton's Discovery of Quaternions

*Mathematics Magazine*, Vol. 49, no. 5 (1976), pp. 227–234.