Function of several real variablesMathematical function with multiple real-number argumentsIn mathematics, a function of several real variables or real multivariate function is a function with more than one argument, with all arguments being real variables. This concept extends the idea of a function of a real variable to several variables. The "input" variables take real values, while the "output", also called the "value of the function", may be real or complex.
Level setIn mathematics, a level set of a real-valued function f of n real variables is a set where the function takes on a given constant value c, that is: L c ( f ) = { ( x 1 , … , x n ) ∣ f ( x 1 , … , x n ) = c } .
IsoquantAn isoquant (derived from quantity and the Greek word isos, ίσος, meaning "equal"), also known as iso-product curve or equal product curve in microeconomics, is a contour line drawn through the set of points at which the same quantity of output is produced while changing the quantities of two or more inputs. The x and y axis on an isoquant represent two relevant inputs, which are usually a factor of production such as labour, capital, land, or organisation.
ElevationThe elevation of a geographiclocation is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotentialgravitationalsurface (see Geodetic datum § Vertical datum).
Sea levelMean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured.
MapSymbolic depiction of spatial relationshipsIn cartography, a map is a representation or abstraction of geographic reality. Maps are used for a wide range of purposes, including navigation, scientific research, governance, and warfare. A common use is route planning, which enables users to find their way to their destination. Specialized maps called charts are used for nautical navigation (nautical charts) and aviation (aeronautical charts).
CurveIn mathematics, a curve (also called a curved line in older texts) is an object similar to a line, but that does not have to be straight. Intuitively, a curve may be thought of as the trace left by a moving point.
Topographic mapIn modern mapping, a topographic map or topographic sheet is a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines (connecting points of equal elevation), but historically using a variety of methods. Traditional definitions require a topographic map to show both natural and artificial features.
Cross section (geometry)In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces. Cutting an object into slices creates many parallel cross sections.
Graph of a functionIn mathematics, the graph of a functionf{\displaystyle f} is the set of ordered pairs(x,y){\displaystyle (x,y)}, where f(x)=y.{\displaystyle f(x)=y.} In the common case where x{\displaystyle x} and f(x){\displaystyle f(x)} 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.GradientMultivariate derivative (mathematics) This article needs more citations. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: "Gradient" – news · newspapers · books · scholar · JSTOR (January 2018) (Learn how and when to remove this message) The gradient, represented by the blue arrows, denotes the direction of greatest change of a scalar function.CartographyStudy and practice of making mapsCartography () is the study and practice of making and using maps. Combining science, aesthetics and technique, cartography builds on the premise that reality (or an imagined reality) can be modeled in ways that communicate spatial information effectively. The fundamental objectives of traditional cartography are to: Set the map's agenda and select traits of the object to be mapped. This is the concern of map editing.
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