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# number theory

## New Proof Settles How to Approximate Numbers Like Pi

August 14, 2019

The ancient Greeks wondered when “irrational” numbers can be approximated by fractions. By proving the longstanding Duffin-Schaeffer conjecture, two mathematicians have provided a complete answer.

## Why the Proof of Fermat’s Last Theorem Doesn’t Need to Be Enhanced

June 3, 2019

Decades after the landmark proof of Fermat’s Last Theorem, ideas abound for how to make it even more reliable. But such efforts reflect a deep misunderstanding of what makes the proof so important.

## The Subtle Art of the Mathematical Conjecture

May 7, 2019

It’s an educated guess, not a proof. But a good conjecture will guide math forward, pointing the way into the mathematical unknown.

## Mathematicians Discover the Perfect Way to Multiply

April 11, 2019

By chopping up large numbers into smaller ones, researchers have rewritten a fundamental mathematical speed limit.

## Sum-of-Three-Cubes Problem Solved for ‘Stubborn’ Number 33

March 26, 2019

A number theorist with programming prowess has found a solution to 33 = x³ + y³ + z³, a much-studied equation that went unsolved for 64 years.

## Smaller Is Better: Why Finite Number Systems Pack More Punch

February 11, 2019

Recent progress on the “sum product” problem recalls a celebrated mathematical result that revealed the power of miniature number systems.

## How a Strange Grid Reveals Hidden Connections Between Simple Numbers

February 6, 2019

A graduate student has helped illuminate a long-suspected connection between addition and multiplication.

## Mathematicians Seal Back Door to Breaking RSA Encryption

December 17, 2018

Digital security depends on the difficulty of factoring large numbers. A new proof shows why one method for breaking digital encryption won’t work.

## In the Universe of Equations, Virtually All Are Prime

December 10, 2018

Equations, like numbers, cannot always be split into simpler elements.