# Reference - Schwarz's Proof of Clairaut's Theorem

Where can I find a copy (online) of Schwarz's paper that proved Clairaut's theorem for mixed partial derivatives? His paper is: Schwarz, H. A., "Communication", Archives des Sciences Physiques et Naturelles, v. 48 (1873), p. 38-44.

## 1 Answer

You can download the journal here:

https://www.biodiversitylibrary.org/bibliography/5919#/summary

There are also Collected works of Schwarz:

https://archive.org/details/gesammeltemathem02schwuoft