# Number concept

Free to read here, from Project Gutenberg.

2 titles; page 1 of 1.

- [The Number Concept: Its Origin and Development](https://invisiblenetwork.ai/books/gutenberg/16449) by Levi L. Conant
- [Die Grundlagen der Arithmetik](https://invisiblenetwork.ai/books/gutenberg/48312) by Gottlob Frege