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Abstract and concrete
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{{short description|Classifications that denote whether a term describes an object with a physical referent or one with no physical referents}}{{redirect|Abstract entity|the album by Kiana|Abstract Entity}}Abstract and concrete are classifications that denote whether the object that a term describes has physical referents. Abstract objects have no physical referents, whereas concrete objects do. They are most commonly used in philosophy and semantics. Abstract objects are sometimes called abstracta (sing. abstractum) and concrete objects are sometimes called (wikt:concreta|concreta) (sing. concretum). An abstract object is an object that does not exist at any particular time or place, but rather exists as a type of thing—i.e., an idea, or abstraction.BOOK, A Glossary of Literary Terms,weblink 18 September 2012, 0495898023, Abrams, Meyer Howard, Harpham, Geoffrey Galt, 2011, The term abstract object is said to have been coined by Willard Van Orman Quine.BOOK, Armstrong, D. M., Sketch for a systematic metaphysics, 2010, Oxford University Press, Oxford, 9780199655915, 2, The study of abstract objects is called abstract object theory.

In philosophy

The type–token distinction identifies physical objects that are tokens of a particular type of thing.Carr, Philip (2012) "The Philosophy of Phonology" in Philosophy of Linguistics (ed. Kemp, Fernando, Asher), Elsevier, p. 404 The "type" of which it is a part is in itself an abstract object. The abstract-concrete distinction is often introduced and initially understood in terms of paradigmatic examples of objects of each kind:{| class="wikitable"|+ Examples of abstract and concrete objects
!Abstract!Concrete
| Tennis| A tennis match
| Redness| Red light reflected off of an apple and hitting one's eyes
| Five| Five cars
| Justice| A just action
| Humanity (the property of being human)| Human population (the set of all humans)
Abstract objects have often garnered the interest of philosophers because they raise problems for popular theories. In ontology, abstract objects are considered problematic for physicalism and some forms of naturalism. Historically, the most important ontological dispute about abstract objects has been the problem of universals. In epistemology, abstract objects are considered problematic for empiricism. If abstracta lack causal powers or spatial location, how do we know about them? It is hard to say how they can affect our sensory experiences, and yet we seem to agree on a wide range of claims about them. Some, such as Edward Zalta and arguably, Plato in his Theory of Forms, have held that abstract objects constitute the defining subject matter of metaphysics or philosophical inquiry more broadly. To the extent that philosophy is independent of empirical research, and to the extent that empirical questions do not inform questions about abstracta, philosophy would seem especially suited to answering these latter questions. In modern philosophy, the distinction between abstract and concrete was explored by Immanuel KantKrV A51/B75–6. See also: Edward Willatt, Kant, Deleuze and Architectonics, Continuum, 2010 p. 17: "Kant argues that cognition can only come about as a result of the union of the abstract work of the understanding and the concrete input of sensation." and G. W. F. Hegel.Georg Wilhelm Friedrich Hegel: The Science of Logic, Cambridge University Press, 2010, p. 609. See also: Richard Dien Winfield, Hegel's Science of Logic: A Critical Rethinking in Thirty Lectures, Rowman & Littlefield Publishers, 2012, p. 265.Gottlob Frege said that abstract objects, such as numbers, were members of a third realm,Gottlob Frege, "Der Gedanke. Eine logische Untersuchung," in: Beiträge zur Philosophie des deutschen Idealismus 1 (1918/19), pp. 58–77; esp. p. 69.Cf. Popper's three worlds. different from the external world or from internal consciousness.WEB, Rosen, Gideon, Abstract Objects,weblink The Stanford Encyclopedia of Philosophy, Metaphysics Research Lab, Stanford University, 1 January 2017, 1 January 2014,

Abstract objects and causality

Another popular proposal for drawing the abstract-concrete distinction contends that an object is abstract if it lacks any causal powers. A causal power has the ability to affect something causally. Thus, the empty set is abstract because it cannot act on other objects. One problem for this view is that it is not clear exactly what it is to have a causal power. For a more detailed exploration of the abstract-concrete distinction, follow the link below to the Stanford Encyclopedia article.SEP, abstract-objects, Abstract Objects, Rosen, Gideon,

Quasi-abstract entities

Recently, there has been some philosophical interest in the development of a third category of objects known as the quasi-abstract. Quasi-abstract objects have drawn particular attention in the area of social ontology and documentality. Some argue that the over-adherence to the platonist duality of the concrete and the abstract has led to a large category of social objects having been overlooked or rejected as nonexisting because they exhibit characteristics that the traditional duality between concrete and abstract regards as incompatible.B. Smith (2008), "Searle and De Soto: The New Ontology of the Social World." In The Mystery of Capital and the Construction of Social Reality. Open Court. Specially, the ability to have temporal location, but not spatial location, and have causal agency (if only by acting through representatives).E. H. Robinson, "A Theory of Social Agentivity and Its Integration into the Descriptive Ontology for Linguistic and Cognitive Engineering", International Journal on Semantic Web and Information Systems 7(4) (2011) pp. 62–86. These characteristics are exhibited by a number of social objects, including states of the international legal system.E. H. Robinson (2014), "A Documentary Theory of States and Their Existence as Quasi-Abstract Entities," Geopolitics 19 (3), pp. 1–29.

Concrete and abstract thought in psychology

Jean Piaget uses the terms "concrete" and "formal" to describe two different types of learning. Concrete thinking involves facts and descriptions about everyday, tangible objects, while abstract (formal operational) thinking involves a mental process.{| class="wikitable"! Concrete idea! Abstract idea
| Dense things sink.| It will sink if its density is greater than the density of the fluid.
| You breathe in oxygen and breathe out carbon dioxide.| Gas exchange takes place between the air in the alveoli and the blood.
| Plants get water through their roots.| Water diffuses through the cell membrane of the root hair cells.

See also

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References

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External links

{{metaphysics}}{{philosophy of mind}}

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