Graph of a function
Function 

x ↦ f (x) 
History of the function concept 
Examples of domains and codomains 
Classes/properties 
Constructions 
Generalizations 
In mathematics, the graph of a function is the set of ordered pairs , where In the common case where and are real numbers, these pairs are Cartesian coordinates of points in a plane and often form a curve. The graphical representation of the graph of a function is also known as a plot.
In the case of functions of two variables – that is, functions whose domain consists of pairs –, the graph usually refers to the set of ordered triples where . This is a subset of threedimensional space; for a continuous realvalued function of two real variables, its graph forms a surface, which can be visualized as a surface plot.
In science, engineering, technology, finance, and other areas, graphs are tools used for many purposes. In the simplest case one variable is plotted as a function of another, typically using rectangular axes; see Plot (graphics) for details.
A graph of a function is a special case of a relation. In the modern foundations of mathematics, and, typically, in set theory, a function is actually equal to its graph.^{[1]} However, it is often useful to see functions as mappings,^{[2]} which consist not only of the relation between input and output, but also which set is the domain, and which set is the codomain. For example, to say that a function is onto (surjective) or not the codomain should be taken into account. The graph of a function on its own does not determine the codomain. It is common^{[3]} to use both terms function and graph of a function since even if considered the same object, they indicate viewing it from a different perspective.
Definition
[edit]Given a function from a set X (the domain) to a set Y (the codomain), the graph of the function is the set^{[4]} which is a subset of the Cartesian product . In the definition of a function in terms of set theory, it is common to identify a function with its graph, although, formally, a function is formed by the triple consisting of its domain, its codomain and its graph.
Examples
[edit]Functions of one variable
[edit]The graph of the function defined by is the subset of the set
From the graph, the domain is recovered as the set of first component of each pair in the graph . Similarly, the range can be recovered as . The codomain , however, cannot be determined from the graph alone.
The graph of the cubic polynomial on the real line is
If this set is plotted on a Cartesian plane, the result is a curve (see figure).
Functions of two variables
[edit]The graph of the trigonometric function is
If this set is plotted on a three dimensional Cartesian coordinate system, the result is a surface (see figure).
Oftentimes it is helpful to show with the graph, the gradient of the function and several level curves. The level curves can be mapped on the function surface or can be projected on the bottom plane. The second figure shows such a drawing of the graph of the function:
See also
[edit]References
[edit] ^ Charles C Pinter (2014) [1971]. A Book of Set Theory. Dover Publications. p. 49. ISBN 9780486795492.
 ^ T. M. Apostol (1981). Mathematical Analysis. AddisonWesley. p. 35.
 ^ P. R. Halmos (1982). A Hilbert Space Problem Book. SpringerVerlag. p. 31. ISBN 0387906851.
 ^ D. S. Bridges (1991). Foundations of Real and Abstract Analysis. Springer. p. 285. ISBN 0387982396.
Further reading
[edit] Zălinescu, Constantin (30 July 2002). Convex Analysis in General Vector Spaces. River Edge, N.J. London: World Scientific Publishing. ISBN 9789814488150. MR 1921556. OCLC 285163112 – via Internet Archive.
External links
[edit] Weisstein, Eric W. "Function Graph." From MathWorld—A Wolfram Web Resource.
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