# Category: Math

## Triangles

## The Map of Mathematics

## Gottlob Frege – Grundgesetze der Arithmetik

Hardly anything more unfortunate can befall a scientific writer than to have one of the foundations of his edifice shaken after the work is finished. This was the position I was placed in by a letter of Mr. Bertrand Russell, just when the printing of this volume was nearing its completion.

## The calculus of contagion

## Hofstadter

All consistent axiomatic formulations of number theory include undecidable propositions.