# Cam's Blog

## January 7, 2011

### The ring that binds them all is…

Filed under: Math, Quote, Random — cfranc @ 1:47 pm

$\widetilde{\mathbf{B}}^\dagger_{\text{log}}$. Just caught that gem as the last line in the first appendix to Laurent Berger’s wonderful paper An introduction to the theory of p-adic representations (see page 38). It is particularly fitting when juxtaposed with his terrific diagram of all the various rings that arise in p-adic Hodge theory. (Ps. Berger is riffing on Tolkien there, in case you missed the joke.)