The Elements of Mathematics volumes weren't exactly textbooks and contained novel proofs. Also, the Bourbaki group published some papers containing novel theore

The Elements of Mathematics volumes weren't exactly textbooks and contained novel proofs. Also, the Bourbaki group published some papers containing novel theorems. For example: https://en.wikipedia.org/wiki/Bourbaki%E2%80%93Witt_theorem https://en.wikipedia.org/wiki/Bourbaki%E2%80%93Witt_theorem