40 relations: Cartesian coordinate system, Cartogram, Coordinate system, Cubic function, Cut and fill, Domain knowledge, Electronics, Focal length, Food Standards Agency, Function (mathematics), Graph paper, Greek language, Harmonic mean, Hilbert's thirteenth problem, Law of sines, Lawrence Joseph Henderson, Lens (optics), Linearity, Logarithmic scale, Log–log plot, Ohm, Optics, Pearson's chi-squared test, Philbert Maurice d'Ocagne, Public analyst, Quadratic equation, Real image, Risk assessment, Scale (ratio), Semi-log plot, Slide rule, Smith chart, Sputnik 1, Student's t-test, Systems analysis, Tephigram, Thermodynamic diagrams, Thin lens, Type I and type II errors, Yates's correction for continuity.

## Cartesian coordinate system

A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length.

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## Cartogram

A cartogram is a map in which some thematic mapping variable – such as travel time, population, or GNP – is substituted for land area or distance.

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## Coordinate system

In geometry, a coordinate system is a system which uses one or more numbers, or coordinates, to uniquely determine the position of the points or other geometric elements on a manifold such as Euclidean space.

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## Cubic function

In algebra, a cubic function is a function of the form in which is nonzero.

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## Cut and fill

In earthmoving, cut and fill is the process of constructing a railway, road or canal whereby the amount of material from cuts roughly matches the amount of fill needed to make nearby embankments, so minimizing the amount of construction labor.

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## Domain knowledge

Domain knowledge is knowledge of a specific, specialized discipline or field, in contrast to general knowledge, or domain-independent knowledge.

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## Electronics

Electronics is the discipline dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors.

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## Focal length

The focal length of an optical system is a measure of how strongly the system converges or diverges light.

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## Food Standards Agency

The Food Standards Agency is a non-ministerial government department of the Government of the United Kingdom.

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## Function (mathematics)

In mathematics, a function was originally the idealization of how a varying quantity depends on another quantity.

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## Graph paper

Graph paper, coordinate paper, grid paper, or squared paper is writing paper that is printed with fine lines making up a regular grid.

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## Greek language

Greek (Modern Greek: ελληνικά, elliniká, "Greek", ελληνική γλώσσα, ellinikí glóssa, "Greek language") is an independent branch of the Indo-European family of languages, native to Greece and other parts of the Eastern Mediterranean and the Black Sea.

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## Harmonic mean

In mathematics, the harmonic mean (sometimes called the subcontrary mean) is one of several kinds of average, and in particular one of the Pythagorean means.

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## Hilbert's thirteenth problem

Hilbert's thirteenth problem is one of the 23 Hilbert problems set out in a celebrated list compiled in 1900 by David Hilbert.

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## Law of sines

In trigonometry, the law of sines, sine law, sine formula, or sine rule is an equation relating the lengths of the sides of a triangle (any shape) to the sines of its angles.

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## Lawrence Joseph Henderson

Lawrence Joseph Henderson (June 3, 1878, Lynn, Massachusetts – February 10, 1942, Cambridge, Massachusetts) was a physiologist, chemist, biologist, philosopher, and sociologist.

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## Lens (optics)

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.

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## Linearity

Linearity is the property of a mathematical relationship or function which means that it can be graphically represented as a straight line.

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## Logarithmic scale

A logarithmic scale is a nonlinear scale used when there is a large range of quantities.

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## Log–log plot

In science and engineering, a log–log graph or log–log plot is a two-dimensional graph of numerical data that uses logarithmic scales on both the horizontal and vertical axes.

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## Ohm

The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.

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## Optics

Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it.

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## Pearson's chi-squared test

Pearson's chi-squared test (χ) is a statistical test applied to sets of categorical data to evaluate how likely it is that any observed difference between the sets arose by chance.

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## Philbert Maurice d'Ocagne

Philbert Maurice d'Ocagne (25 March 1862 – 23 September 1938) was a French engineer and mathematician.

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## Public analyst

Public Analysts are scientists in the United Kingdom and Ireland whose principal task is to ensure the safety and correct description of food by testing for compliance with legislation.

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## Quadratic equation

In algebra, a quadratic equation (from the Latin quadratus for "square") is any equation having the form where represents an unknown, and,, and represent known numbers such that is not equal to.

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## Real image

In optics, a real image is an image which is located in the plane of convergence for the light rays that originate from a given object.

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## Risk assessment

Risk assessment is the determination of quantitative or qualitative estimate of risk related to a well-defined situation and a recognized threat (also called hazard).

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## Scale (ratio)

The scale ratio of a model represents the proportional ratio of a linear dimension of the model to the same feature of the original.

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## Semi-log plot

In science and engineering, a semi-log graph or semi-log plot is a way of visualizing data that are related according to an exponential relationship.

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## Slide rule

The slide rule, also known colloquially in the United States as a slipstick, is a mechanical analog computer.

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## Smith chart

The Smith chart, invented by Phillip H. Smith (1905–1987), is a graphical aid or nomogram designed for electrical and electronics engineers specializing in radio frequency (RF) engineering to assist in solving problems with transmission lines and matching circuits.

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## Sputnik 1

Sputnik 1 (or; "Satellite-1", or "PS-1", Простейший Спутник-1 or Prosteyshiy Sputnik-1, "Elementary Satellite 1") was the first artificial Earth satellite.

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## Student's t-test

The t-test is any statistical hypothesis test in which the test statistic follows a Student's ''t''-distribution under the null hypothesis.

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## Systems analysis

The Merriam-Webster dictionary defines system analysis as "the process of studying a procedure or business in order to identify its goals and purposes and create systems and procedures that will achieve them in an efficient way".

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## Tephigram

A tephigram is one of four thermodynamic diagrams commonly used in weather analysis and forecasting.

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## Thermodynamic diagrams

Thermodynamic diagrams are diagrams used to represent the thermodynamic states of a material (typically fluid) and the consequences of manipulating this material.

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## Thin lens

In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the radii of curvature of the lens surfaces.

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## Type I and type II errors

In statistical hypothesis testing, a type I error is the rejection of a true null hypothesis (also known as a "false positive" finding), while a type II error is failing to reject a false null hypothesis (also known as a "false negative" finding).

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## Yates's correction for continuity

In statistics, Yates's correction for continuity (or Yates's chi-squared test) is used in certain situations when testing for independence in a contingency table.

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## Redirects here:

Nomograms, Nomograph, Nomographic, Nomography.