Erica Klarreich

Contributing Correspondent

Photo of Ziegler's chalkboard
Abstractions blog

The Infinite Primes and Museum Guard Proofs, Explained

March 26, 2018

A simple, step-by-step breakdown of two “perfect” math proofs.

Portrait of Mathematician Prof. Günter M. Ziegler
Q&A

In Search of God’s Perfect Proofs

March 19, 2018

The mathematicians Günter Ziegler and Martin Aigner have spent the past 20 years collecting some of the most beautiful proofs in mathematics.

520px illustration for scale=free networks
network science

Scant Evidence of Power Laws Found in Real-World Networks

February 15, 2018

A new study challenges one of the most celebrated and controversial ideas in network science.

Federico Ardila
Q&A

A Mathematician Who Dances to the Joys and Sorrows of Discovery

November 20, 2017

Federico Ardila opens up about his journey as a mathematician, teacher, Colombian transplant, DJ and creator of mathematical spaces.

Pariah moonshine
number theory

Mathematicians Find Moonshine Link for Pariah Symmetries

September 22, 2017

A type of symmetry so unusual that it was called a “pariah” turns out to have deep connections to number theory.

Nash equilibrium maze
Game Theory

In Game Theory, No Clear Path to Equilibrium

July 18, 2017

John Nash’s notion of equilibrium is ubiquitous in economic theory, but a new study shows that it is often impossible to reach efficiently.

Illustration of a salamander
applied math

How to Quantify (and Fight) Gerrymandering

April 4, 2017

Powerful new quantitative tools are now available to combat partisan bias in the drawing of voting districts.

Illustration: boxing gloves
Abstractions blog

Graph Isomorphism Vanquished — Again

January 14, 2017

Just five days after posting a retraction, László Babai announced that he had fixed the error in his landmark graph isomorphism algorithm.

Illustration: boxing glove & graph
Abstractions blog

Complexity Theory Problem Strikes Back

January 5, 2017

The legendary graph isomorphism problem may be harder than a 2015 result seemed to suggest.