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neurosis

(Encyclopedia)neurosis, in psychiatry, a broad category of psychological disturbance, encompassing various mild forms of mental disorder. Until fairly recently, the term neurosis was broadly employed in contrast wi...

symbolic logic

(Encyclopedia)symbolic logic or mathematical logic, formalized system of deductive logic, employing abstract symbols for the various aspects of natural language. Symbolic logic draws on the concepts and techniques ...

semantics

(Encyclopedia)semantics [Gr.,=significant] in general, the study of the relationship between words and meanings. The empirical study of word meanings and sentence meanings in existing languages is a branch of lingu...

nucleosynthesis

(Encyclopedia)nucleosynthesis or nucleogenesis, in astronomy, production of all the chemical elements from the simplest element, hydrogen, by thermonuclear reactions within stars, supernovas, and in the big bang at...

Matisse, Henri

(Encyclopedia)Matisse, Henri äNrēˈ mätēsˈ [key], 1869–1954, French painter, sculptor, and lithographer. Along with Picasso, Matisse is considered one of the two foremost artists of the modern period. His co...

Wittgenstein, Ludwig Josef Johann

(Encyclopedia)Wittgenstein, Ludwig Josef Johann loŏtˈvĭkh yōˈzĕf yōˈhän vĭtˈgənshtīn [key], 1889–1951, Austrian philosopher, b. Vienna. The second phase of Wittgenstein's philosophy commenced with ...

Yeats, W. B.

(Encyclopedia)Yeats, W. B. (William Butler Yeats), 1865–1939, Irish poet and playwright, b. Dublin. The greatest lyric poet Ireland has produced and one of the major figures of 20th-century literature, Yeats was ...

stellar evolution

(Encyclopedia)CE5 The above Hertzsprung-Russell (H-R) diagram shows the track of stellar evolution for a typical star. After spending much of its life evolving toward or along the main sequence, the star becomes...

child abuse

(Encyclopedia)child abuse, physical, sexual, or emotional maltreatment or neglect of children by parents, guardians, or others responsible for a child's welfare. Physical abuse is characterized by physical injury, ...

logic

(Encyclopedia)logic, the systematic study of valid inference. A distinction is drawn between logical validity and truth. Validity merely refers to formal properties of the process of inference. Thus, a conclusion w...