His work is closely linked with the emergence of algebraic topology; it is most decisively thanks to his early works that this area established itself as a new and important branch of mathematics. his work has influenced profoundly the evolution not only of topology but of a large part of mathematics.
Kanyang trabaho ay malapit na-link sa paglitaw ng mga algebraic topology; ito ay pinaka-tiyak, salamat sa kanyang maagang gumagana na ang lugar na ito itinatag ang sarili bilang isang bago at mahalagang sangay ng matematika. kanyang trabaho ay naiimpluwensyahan profoundly ang ebolusyon hindi lamang ng topology ngunit ng isang malaking bahagi ng matematika.