Talk:Ground expression

Should be merged with the Sentence (mathematical logic) article
Sentence and ground formula are terms that mean the same thing. It would also help clarify this section of the Well-formed-formula article. Luot (talk) 20:15, 15 December 2014 (UTC)

Reference Forbidden
http://web.engr.oregonstate.edu/~afern/classes/cs532/notes/fo-ss.pdf is returning 403 Forbidden. Does anyone know of an updated version of this page, or a replacement? --Hyper Anthony (talk) 19:34, 25 September 2012 (UTC)

Conflicting definitions of "ground expression"
"The semantics of predicate logic as a programming language" says ""An expression (term, literal, clause, set of clauses) is ground if it contains no variables" and "Stanford's Herbrand Semantics" says "An expression is ground if and only if it contains no variables."  These apparently contradict the article's statement, "ground term of a formal system is a term that does not contain any free variables."  More directly in contradiction is the Herbrand Semantics statement "For example, the sentence p(a) is ground, whereas the sentence ∀x.p(x) is not." whereas the article states "the sentence ∀x (x=x) is a ground formula." Jim Bowery (talk) 16:48, 14 June 2019 (UTC)