In mathematics, the symmetric difference of two sets, also known as the disjunctive union, is the set of elements which are in either of the sets, but not in their intersection.For example, the symmetric difference of the sets {,,} and {,} is {,,}.. The symmetric difference of the sets A and B is commonly denoted by , or ⁡.. The power set of any set becomes an abelian group under the …

Semantic change. Many pairs of cognates have come to have different meanings due to semantic change.These false friends include the following: Spanish diseñar means 'to design' in Spanish, while its Portuguese cognate desenhar means 'to draw'.; Similarly, Spanish dibujo for 'drawing', with an archaic Portuguese equivalent debuxo meaning 'sketch' and was displaced by …

Linear speed is the distance travelled per unit of time, while tangential speed (or tangential velocity) is the linear speed of something moving along a circular path. A point on the outside edge of a merry-go-round or turntable travels a greater distance in one complete rotation than a point nearer the center. Travelling a greater distance in the same time means a greater speed, …

Assertiveness is the quality of being self-assured and confident without being aggressive to defend a right point of view or a relevant statement. In the field of psychology and psychotherapy, it is a skill that can be learned and a mode of communication. Dorland's Medical Dictionary defines assertiveness as: "a form of behavior characterized by a confident declaration or …

An injunction is a legal and equitable remedy in the form of a special court order that compels a party to do or refrain from specific acts. " When a court employs the extraordinary remedy of injunction, it directs the conduct of a party, and does so with the backing of its full coercive powers." A party that fails to comply with an injunction faces criminal or civil penalties, …

Sexual dimorphism is the condition where the sexes of the same species exhibit different characteristics, particularly characteristics not directly involved in reproduction. The condition occurs in most animals and some plants. Differences may include secondary sex characteristics, size, weight, colour, markings, or behavioural or cognitive traits.. These differences may be …

Voltage, also known as electric pressure, electric tension, or (electric) potential difference, is the difference in electric potential between two points. In a static electric field, it corresponds to the work needed per unit of charge to move a test charge between the two points. In the International System of Units, the derived unit for voltage is named volt.

All modern humans are classified into the species Homo sapiens, coined by Carl Linnaeus in his 1735 work Systema Naturae. The generic name "Homo" is a learned 18th-century derivation from Latin homō, which refers to humans of either sex. The word human can refer to all members of the Homo genus, although in common usage it generally just refers to Homo sapiens, the only …

Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane.. Gram-negative bacteria are found in virtually all …

The English word incest is derived from the Latin incestus, which has a general meaning of "impure, unchaste".It was introduced into Middle English, both in the generic Latin sense (preserved throughout the Middle English period) and in the narrow modern sense.The derived adjective incestuous appears in the 16th century. Before the Latin term came in, incest was …