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A reference is a relationship between objects in which one object designates, or acts as a means by which to tướng connect to tướng or liên kết to tướng, another object. The first object in this relation is said to tướng refer to the second object. It is called a name for the second object. The next object, the one to tướng which the first object refers, is called the referent of the first object. A name is usually a phrase or expression, or some other symbolic representation. Its referent may be anything – a material object, a person, an sự kiện, an activity, or an abstract concept.
References can take on many forms, including: a thought, a sensory perception that is audible (onomatopoeia), visual (text), olfactory, or tactile, emotional state, relationship with other, spacetime coordinates, symbolic or alpha-numeric, a physical object, or an energy projection. In some cases, methods are used that intentionally hide the reference from some observers, as in cryptography.
Reference feature in many spheres of human activity and knowledge, and the term adopts shades of meaning particular to tướng the contexts in which it is used. Some of them are described in the sections below.
Etymology and meanings
The word reference is derived from Middle English referren, from Middle French référer, from Latin referre, "to carry back", formed from the prefix re- and ferre, "to bear". A number of words derive from the same root, including refer, referee, referential, referent, referendum.
The verb refer (to) and its derivatives may carry the sense of "connect to" or "link to", as in the meanings of reference described in this article. Another sense is "consult"; this is reflected in such expressions as reference work, reference desk, job reference, etc.
In semantics, reference is generally construed as the relationships between nouns or pronouns and objects that are named by them. Hence, the word "John" refers to tướng the person John. The word "it" refers to tướng some previously specified object. The object referred to tướng is called the referent of the word. Sometimes the word-object relation is called "denotation"; the word denotes the object. The converse relation, the relation from object to tướng word, is called "exemplification"; the object exemplifies what the word denotes. In syntactic analysis, if a word refers to tướng a previous word, the previous word is called the "antecedent".
Gottlob Frege argued that reference cannot be treated as identical with meaning: "Hesperus" (an ancient Greek name for the evening star) and "Phosphorus" (an ancient Greek name for the morning star) both refer to tướng Venus, but the astronomical fact that '"Hesperus" is "Phosphorus"' can still be informative, even if the "meanings" of "Hesperus" and "Phosphorus" are already known. This problem led Frege to tướng distinguish between the sense and reference of a word. Some cases seem to tướng be too complicated to tướng be classified within this framework; the acceptance of the notion of secondary reference may be necessary to tướng fill the gap. See also Opaque context.
The very concept of the linguistic sign is the combination of nội dung and expression, the former of which may refer entities in the world or refer more abstract concepts, e.g. thought. Certain parts of speech exist only to tướng express reference, namely anaphora such as pronouns. The subset of reflexives expresses co-reference of two participants in a sentence. These could be the agent (actor) and patient (acted on), as in "The man washed himself", the theme and recipient, as in "I showed Mary to tướng herself", or various other possible combinations.
In computer science, references are data types that refer to tướng an object elsewhere in memory and are used to tướng construct a wide variety of data structures, such as linked lists. Generally, a reference is a value that enables a program to tướng directly access the particular data item. Most programming languages tư vấn some size of reference. For the specific type of reference used in the C++ language, see reference (C++).
The notion of reference is also important in relational database theory; see referential integrity.
Library and information sciences
References to tướng many types of printed matter may come in an electronic or machine-readable size. For books, there exists the ISBN and for journal articles, the Digital object identifier (DOI) is gaining relevance. Information on the Internet may be referred to tướng by a Uniform Resource Identifier (URI).
In terms of mental processing, a self-reference is used in psychology to tướng establish identification with a mental state during self-analysis. This seeks to tướng allow the individual to tướng develop own frames of reference in a greater state of immediate awareness. However, it can also lead to tướng circular reasoning, preventing evolution of thought.
According to tướng Perceptual Control Theory (PCT), a reference condition is the state toward which a control system's output tends to tướng alter a controlled quantity. The main proposition is that "All behavior is oriented all of the time around the control of certain quantities with respect to tướng specific reference conditions."
In academics and scholarship, a reference or bibliographical reference is a piece of information provided in a footnote or bibliography of a written work such as a book, article, essay, report, oration or any other text type, specifying the written work of another person used in the creation of that text. A bibliographical reference mostly includes the full name of the author, the title of their work and the year of publication. The primary purpose of references is to tướng allow readers to tướng examine the sources of a text, either for validity or to tướng learn more about the subject. Such items are often listed at the over of a work in a section marked References or Bibliography.
References are particularly important as for the use of citations, since copying of material by another author without proper reference and / or without required permissions is considered plagiarism, and may be tantamount to tướng copyright infringement, which can be subject to tướng legal proceedings. A reference section contains only those works indeed cited in the main text of a work. In contrast, a bibliographical section often contains works not cited by the author, but used as background reading or listed as potentially useful to tướng the reader.
Keeping a diary allows an individual to tướng use references for personal organization, whether or not anyone else understands the systems of reference used. However, scholars have studied methods of reference because of their key role in communication and co-operation between different people, and also because of misunderstandings that can arise. Modern academic study of bibliographical references has been developing since the 19th century.
In patent law, a reference is a document that can be used to tướng show the state of knowledge at a given time and that therefore may make a claimed invention obvious or anticipated. Examples of references are patents of any country, magazine articles, Ph.D. theses that are indexed and thus accessible to tướng those interested in finding information about the subject matter, and to tướng some extent Internet material that is similarly accessible.
In art, a reference is an item from which a work is based. This may include:
- an existing artwork
- a reproduction (i.e., a photo)
- a directly observed object (e.g., a person)
- the artist's memory
Another example of reference is samples of various musical works being incorporated into a new one.
- Antecedent (grammar)
- Generic antecedent
- ISO 690
- Recommendation letter
- Signified and signifier
- ^ Treanor, Brian (2006). Aspects of alterity: Levinas, Marcel, and the contemporary debate. Fordham University Press. p. 41. ISBN 9780823226849.
- ^ Klein, Ernest, A comprehensive etymological dictionary of the English language, Vol II, Elsevier publishing company, Amsterdam, 1969, p.1317
- ^ Saeed, John (10 February 2003). Semantics. Blackwell. p. 12. ISBN 0-631-22693-1.
- ^ Engle, Eric (2010). Lex Naturalis, Ius Naturalis: Law as Positive Reasoning & Natural Rationality. Melbourne, Australia: The Rlias Clark Group. p. 75. ISBN 9780980731842.
- ^ Powers, William (2005). Behavior: The Control of Perception (2nd ed.). New Canaan, Connecticut: Benchmark Publications. pp. 47 & 299.
- ^ Reimer, Marga (2009). "Reference". Stanford Encyclopedia of Philosophy.
Look up reference in Wiktionary, the không lấy phí dictionary.
- Reference.com – a multi-source encyclopedia tìm kiếm service, and language reference products provider
- "Reference Resources". Yahoo! Directory.
- References.net – a directory of multidisciplinary reference resources on the web
- Refmuseum.com - The online museum of references