essential subgroup
41Potential theory — may be defined as the study of harmonic functions. Definition and comments The term potential theory arises from the fact that, in 19th century physics, the fundamental forces of nature were believed to be derived from potentials which satisfied… …
42algebra — /al jeuh breuh/, n. 1. the branch of mathematics that deals with general statements of relations, utilizing letters and other symbols to represent specific sets of numbers, values, vectors, etc., in the description of such relations. 2. any of… …
43ancient Greek civilization — ▪ historical region, Eurasia Introduction the period following Mycenaean civilization, which ended in about 1200 BC, to the death of Alexander the Great, in 323 BC. It was a period of political, philosophical, artistic, and scientific… …
44Society and culture of the Han Dynasty — A Western Han jade carved door knocker with designs of Chinese dragons (and two other jade figurines) The Han Dynasty (206 BCE – 220 CE) was a period of ancient China divided by the Western Han (206 BCE – 9 CE) and Eastern Han (25–220 CE) periods …
45European Democrats — The European Democrats is a loose association of Conservative parties in Europe. It is a political group in the Parliamentary Assembly of the Council of Europe. It was a political group (until 1992) and is a subgroup of EPP ED (since 1992) in the …
46Emmy Noether — Amalie Emmy Noether Born 23 March 1882(1882 03 23) …
47Principal bundle — In mathematics, a principal bundle is a mathematical object which formalizes some of the essential features of a Cartesian product X times; G of a space X with a group G . Analogous to the Cartesian product, a principal bundle P is equipped with… …
48Rotation matrix — In linear algebra, a rotation matrix is a matrix that is used to perform a rotation in Euclidean space. For example the matrix rotates points in the xy Cartesian plane counterclockwise through an angle θ about the origin of the Cartesian… …
49Anatolian languages — Branch of the Indo European language family spoken in Anatolia in the 2nd–1st millennia BC. The attested Anatolian languages are Hittite, Palaic, Luwian (Luvian), Hieroglyphic Luwian, Lycian, and Lydian. Hittite, by far the most copiously… …
50Veganism — Veganism …
