valid sentence
21Entailment — For other uses, see Entail (disambiguation). In logic, entailment is a relation between a set of sentences (e.g.,[1] meaningfully declarative sentences or truthbearers) and a sentence. Let Γ be a set of one or more sentences; let S1 be the… …
22History of logic — Philosophy ( …
23Ecclesiastical Censures — Ecclesiastical Censures † Catholic Encyclopedia ► Ecclesiastical Censures Medicinal and spiritual punishments imposed by the Church on a baptized, delinquent, and contumacious person, by which he is deprived, either wholly of in part …
24Second-order logic — In logic and mathematics second order logic is an extension of first order logic, which itself is an extension of propositional logic.[1] Second order logic is in turn extended by higher order logic and type theory. First order logic uses only… …
25Interpretation (logic) — An interpretation is an assignment of meaning to the symbols of a formal language. Many formal languages used in mathematics, logic, and theoretical computer science are defined in solely syntactic terms, and as such do not have any meaning until …
26Miranda warning — The Miranda warning (also referred to as Miranda rights) is a warning that is required to be given by police in the United States to criminal suspects in police custody (or in a custodial interrogation) before they are interrogated to inform them …
27Federal Marriage Amendment — The Federal Marriage Amendment H.J. Res. 56 (FMA) (also referred to by proponents as the Marriage Protection Amendment) was a proposed amendment to the United States Constitution which would have limited marriage in the United States to unions of …
28Judicial system of the People's Republic of China — For the Ministry of Justice, see Ministry of Justice of the People s Republic of China. People s Republic of China This article is part of the series: Politics and government of …
29Tautology (logic) — In propositional logic, a tautology (from the Greek word ταυτολογία) is a propositional formula that is true under any possible valuation (also called a truth assignment or an interpretation) of its propositional variables. For example, the… …
30formal logic — the branch of logic concerned exclusively with the principles of deductive reasoning and with the form rather than the content of propositions. [1855 60] * * * Introduction the abstract study of propositions, statements, or assertively used …
