u/Aggravating-Tea-Leaf

Hello, I am a physics B.Sc. student looking to extend my mathematical repetoir if you will.

I was researching the so called “Phase space” as related to Liouville’s theorem. I learned that the Ehrenfests, Tatyana and her more commonly known husband Paul Ehrenfest, were the ones to coin the term in the encyclopedia of mathematical science by Wilhem Franz Meyer and Felix Klein in the 30’s or so.

The official German title is: “Encyklopädie der Mathematischen Wissenschaften mit einschluss der Anwendung”

It is a 21 book series of 6 volumes and I am wondering if anyone here might know where I could get my hands on these books?