I’ve posted a short excerpt from another Semantics textbook (written by Sebastian Löbner) in the “Readings” section of the website.  It discusses how certain semantic relationships between sentences, such as entailment, can be modeled in Propositional Logic.  Please read this excerpt for Th 2/9.

(Note: §4.2 of the reading uses some terms that you won’t be familiar with, such as “CoU” and “Principle of Polarity”.  Don’t worry too much about these…just make sure that you understand the terms “contingent”, “logically true”, and “logically false”.)