well-formed
101Theorem — The Pythagorean theorem has at least 370 known proofs[1] In mathematics, a theorem is a statement that has been proven on the basis of previously established statements, such as other theorems, and previously accepted statements …
102Metalogic — is the study of the metatheory of logic. While logic is the study of the manner in which logical systems can be used to decide the correctness of arguments, metalogic studies the properties of the logical systems themselves.[1] According to… …
103Lièpvre — French commune nomcommune=Lièpvre Lièpvre seen from Hoimbach région=Alsace département=Haut Rhin arrondissement=Ribeauvillé canton=Sainte Marie aux Mines insee=68185 cp=68660 maire=Claude Ruff mandat=2001 2008 intercomm=C.C. du Val d Argent… …
104First-order logic — is a formal logical system used in mathematics, philosophy, linguistics, and computer science. It goes by many names, including: first order predicate calculus, the lower predicate calculus, quantification theory, and predicate logic (a less… …
105Formal proof — See also: mathematical proof, proof theory, and axiomatic system A formal proof or derivation is a finite sequence of sentences (called well formed formulas in the case of a formal language) each of which is an axiom or follows from the… …
106Arabia — • The cradle of Islam and, in all probability, the primitive home of the Semitic race Catholic Encyclopedia. Kevin Knight. 2006. Arabia Arabia …
107Formal language — A formal language is a set of words , i.e. finite strings of letters , or symbols . The inventory from which these letters are taken is called the alphabet over which the language is defined. A formal language is often defined by means of a… …
108Vienna Circle — The Vienna Circle (in German: der Wiener Kreis) was a group of philosophers who gathered around Moritz Schlick when he was called to the Vienna University in 1922, organized in a philosophical association named Verein Ernst Mach (Ernst Mach… …
109First Nations — This article is about the indigenous peoples of Canada. For other indigenous peoples, see Indigenous peoples by geographic regions. First Nations …
110permafrost — /perr meuh frawst , frost /, n. (in arctic or subarctic regions) perennially frozen subsoil. Also called pergelisol. [1943; PERMA(NENT) + FROST] * * * Perennially frozen earth, with a temperature below 32 °F (0 °C) continuously for two years or… …
