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In mathematical logic, propositional logic, and predicate logic, a well-formed formula, abbreviated WFF or wff, often simply formula, is a finite sequence of symbols from a given alphabet, constructed following the defined grammar of a formal language.…

In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, e.g., including only woody plants with secondary growth, only plants that are usable as lumber, or only plants above a specified …

Hollandic or Hollandish (Dutch: Hollands [ˈɦɔlɑnts] ) is the most widely spoken dialect of the Dutch language. Hollandic is among the Central Dutch dialects. Other important language varieties of spoken Low Franconian languages are Brabantian, Flemish (East Flemish, West Flemish), Zeelandic, Limburg…

Hakka is a language group of varieties of Chinese spoken natively by the Hakka people in parts of Southern China, Taiwan, some diaspora areas of Southeast Asia and in overseas Chinese communities around the world.…

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In graph theory, a mixed graph G = (V, E, A) is a graph consisting of a set of vertices V, a set of (undirected) edges E, and a set of directed edges (or arcs) A.…

Existence is the state of having being or reality in contrast to nonexistence and nonbeing. Existence is often contrasted with essence: the essence of an entity is its essential features or qualities, which can be understood even if one does not know whether the entity exists.…

William Shakespeare (c. 23 April 1564 – 23 April 1616) was an English playwright, poet and actor. He is widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon" or simply "the Bard". His ex…

Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south. Poland borders Kaliningrad Oblast and Lithuania to the north; Belarus and Ukraine to the east; Slovakia and the Czech Republic …

The Chicago Sun-Times is a daily nonprofit newspaper published in Chicago, Illinois, United States. Since 2022, it is the flagship paper of Chicago Public Media, and has long held the second largest circulation among Chicago newspapers, after the Chicago Tribune.…