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As this example shows, when like terms exist in an expression, they may be combined by adding or subtracting (whatever the expression indicates) the coefficients, and maintaining the common factor of both terms. Such combination is called combining like terms or collecting like terms, and it is an important tool used for solving equations.
The psychology of collecting is an area of study that seeks to understand the motivating factors explaining why people devote time, money, and energy making and maintaining collections. There exist a variety of theories for why collecting behavior occurs, including consumerism , materialism , neurobiology and psychoanalytic theory .
Bibliophilia is distinct from bibliomania, a compulsive obsession to collect books which can affect interpersonal relationships or health. The term "bibliophile" has been in use since 1820 and has been associated with historical figures like Lord Spencer and J.P. Morgan, who were known for their extensive book collections.
Book collecting is the collecting of books, ... Just like hard copy books, audio books can be accumulated over many years. ... glossary of terms in several languages;
In particular, terms appear as components of a formula. A first-order term is recursively constructed from constant symbols, variables, and function symbols. An expression formed by applying a predicate symbol to an appropriate number of terms is called an atomic formula, which evaluates to true or false in bivalent logics, given an interpretation.
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In all cases, the lack of a dust jacket is noted if the book was issued with one. The same applies to other possible accessories, such as inlays (like errata lists, cards, photo prints, PCBs), foldouts (like maps), media (like diskettes, CDs, DVDs) etc. There is no standard term for books in a condition below poor.
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