A first-order term is recursively constructed from constant symbols, variables and function symbols. An expression formed by applying a predicate symbol to an appropriate number of terms is called an atomic formula, which evaluates to true or false in bivalent logics, given an interpretation.
Season 2 of Expedition Unknown premiered on the Travel Channel in the US on Wednesday, October 7, 2015 and it is set to have twenty one-hour episodes. In the premiere episode, Josh Gates goes to England, Wales, and Scotland in hopes to find the facts and separate them from the myths about legendary King Arthur.
This led to the production of a seventh season, Hoarders: Family Secrets, which aired on Lifetime from May 28, 2015 to July 30, 2015. The program returned to A&E for an eighth season which began January 3, 2016. A second part of the eighth season began on August 21, 2016, under the title: Hoarders: Then and Now.