
This folder contains a proof of (one direction of) the equivalence of different
definitions of the concept of a lattice. For background information about this
proof and an informal version, please see Section 5 of:

S. Hetzl, A. Leitsch, D. Weller, B. Woltzenlogel Paleo: Herbrand Sequent
Extraction. AISC/MKM/Calculemus 2008, Springer LNCS 5144, pg. 462-477

