Excerpt from Decision Procedures for Elementary Sublanguages of Set Theory: XIV. Three Languages Involving Rank Related Constructs In [fos], the theory mls, which is the set of formulas built using the boolean connectives (conjunction, disjunction, implication and negation) from set theoretic atoms of the following types. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.