86 relations: American Dental Association, Ancient Greek, Astronomy, ∂, ∆, Birefringence, Black–Scholes model, Calculus, CCR5, Chemical shift, Compound interest, Continuous function, Convex hull, Covalent bond, Cramer's rule, Cyrillic script, D, Dalet, De (Cyrillic), Declination, Defendant, Deflection (engineering), Deletion (genetics), Delta baryon, Derivative, Deuterium, Differential (mathematics), Dirac delta function, Discriminant, Electric current, Electrical reactance, Electronegativity, Environmental isotopes, Equatorial coordinate system, Eth, F-ATPase, Finite difference, Finite-state machine, Genetics, Greek alphabet, Greek letters used in mathematics, science, and engineering, Greek numerals, Greeks (finance), Herodotus, Isomer, Isotope geochemistry, James David Forbes, John Dee, Kronecker delta, Laplace operator, ..., Latin, Latin alphabet, Latin delta, Limit of a function, List of legal abbreviations, Locant, Macroeconomics, Major seventh chord, Mathematics, Modern Greek, Nabla symbol, Nile, Nuclear magnetic resonance, Optical mineralogy, Organic compound, Partial charge, Partial derivative, Phoenician alphabet, Polynomial, Proceedings of the Royal Society, Proofreading, Quadratic equation, River delta, Romanization of Greek, Simplex, Simplicial complex, Solow–Swan model, Symmetric difference, Th (digraph), Triangle, Uncertainty, Uncertainty principle, Vertex (graph theory), Voiced dental and alveolar stops, Voiced dental fricative, Voltage. Expand index (36 more) »

## American Dental Association

The American Dental Association (ADA) is an American professional association established in 1859 which has more than 155,000 members.

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## Ancient Greek

The Ancient Greek language includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD.

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## Astronomy

Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.

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## ∂

The character ∂ (HTML element: &#8706; or &part;, Unicode: U+2202) or \partial is a stylized d mainly used as a mathematical symbol to denote a partial derivative such as \frac (read as "the partial derivative of z with respect to x").

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## ∆

∆ may refer to.

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## Birefringence

Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light.

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## Black–Scholes model

The Black–Scholes or Black–Scholes–Merton model is a mathematical model for the dynamics of a financial market containing derivative investment instruments.

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## Calculus

Calculus (from Latin calculus, literally 'small pebble', used for counting and calculations, as on an abacus), is the mathematical study of continuous change, in the same way that geometry is the study of shape and algebra is the study of generalizations of arithmetic operations.

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## CCR5

C-C chemokine receptor type 5, also known as CCR5 or CD195, is a protein on the surface of white blood cells that is involved in the immune system as it acts as a receptor for chemokines.

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## Chemical shift

In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of a nucleus relative to a standard in a magnetic field.

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## Compound interest

Compound interest is the addition of interest to the principal sum of a loan or deposit, or in other words, interest on interest.

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## Continuous function

In mathematics, a continuous function is a function for which sufficiently small changes in the input result in arbitrarily small changes in the output.

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## Convex hull

In mathematics, the convex hull or convex envelope or convex closure of a set X of points in the Euclidean plane or in a Euclidean space (or, more generally, in an affine space over the reals) is the smallest convex set that contains X. For instance, when X is a bounded subset of the plane, the convex hull may be visualized as the shape enclosed by a rubber band stretched around X., p. 3.

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## Covalent bond

A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.

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## Cramer's rule

In linear algebra, Cramer's rule is an explicit formula for the solution of a system of linear equations with as many equations as unknowns, valid whenever the system has a unique solution.

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## Cyrillic script

The Cyrillic script is a writing system used for various alphabets across Eurasia (particularity in Eastern Europe, the Caucasus, Central Asia, and North Asia).

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## D

D (named dee) is the fourth letter of the modern English alphabet and the ISO basic Latin alphabet.

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## Dalet

Dalet (also spelled Daleth or Daled) is the fourth letter of the Semitic abjads, including Phoenician Dālet, Hebrew 'Dālet ד, Aramaic Dālath, Syriac Dālaṯ ܕ, and Arabic د (in abjadi order; 8th in modern order).

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## De (Cyrillic)

De (Д д; italics: Д д) is a letter of the Cyrillic script.

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## Declination

In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.

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## Defendant

A defendant is a person accused of committing a crime in criminal prosecution or a person against whom some type of civil relief is being sought in a civil case.

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## Deflection (engineering)

In engineering, deflection is the degree to which a structural element is displaced under a load.

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## Deletion (genetics)

In genetics, a deletion (also called gene deletion, deficiency, or deletion mutation) (sign: Δ) is a mutation (a genetic aberration) in which a part of a chromosome or a sequence of DNA is lost during DNA replication.

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## Delta baryon

The Delta baryons (or Δ baryons, also called Delta resonances) are a family of subatomic particle made of three up or down quarks (u or d quarks).

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## Derivative

The derivative of a function of a real variable measures the sensitivity to change of the function value (output value) with respect to a change in its argument (input value).

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## Deuterium

Deuterium (or hydrogen-2, symbol or, also known as heavy hydrogen) is one of two stable isotopes of hydrogen (the other being protium, or hydrogen-1).

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## Differential (mathematics)

In mathematics, differential refers to infinitesimal differences or to the derivatives of functions.

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## Dirac delta function

In mathematics, the Dirac delta function (function) is a generalized function or distribution introduced by the physicist Paul Dirac.

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## Discriminant

In algebra, the discriminant of a polynomial is a polynomial function of its coefficients, which allows deducing some properties of the roots without computing them.

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## Electric current

An electric current is a flow of electric charge.

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## Electrical reactance

In electrical and electronic systems, reactance is the opposition of a circuit element to a change in current or voltage, due to that element's inductance or capacitance.

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## Electronegativity

Electronegativity, symbol ''χ'', is a chemical property that describes the tendency of an atom to attract a shared pair of electrons (or electron density) towards itself.

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## Environmental isotopes

The environmental isotopes are a subset of the isotopes, both stable and radioactive, which are the object of isotope geochemistry.

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## Equatorial coordinate system

The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects.

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## Eth

Eth (uppercase: Ð, lowercase: ð; also spelled edh or eð) is a letter used in Old English, Middle English, Icelandic, Faroese (in which it is called edd), and Elfdalian.

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## F-ATPase

F-ATPase, also known as F-Type ATPase (also called ATP synthase), is an ATPase found in bacterial plasma membranes, in mitochondrial inner membranes (in oxidative phosphorylation, where it is known as Complex V), and in chloroplast thylakoid membranes.

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## Finite difference

A finite difference is a mathematical expression of the form.

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## Finite-state machine

A finite-state machine (FSM) or finite-state automaton (FSA, plural: automata), finite automaton, or simply a state machine, is a mathematical model of computation.

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## Genetics

Genetics is the study of genes, genetic variation, and heredity in living organisms.

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## Greek alphabet

The Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BC.

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## Greek letters used in mathematics, science, and engineering

Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities.

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## Greek numerals

Greek numerals, also known as Ionic, Ionian, Milesian, or Alexandrian numerals, are a system of writing numbers using the letters of the Greek alphabet.

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## Greeks (finance)

In mathematical finance, the Greeks are the quantities representing the sensitivity of the price of derivatives such as options to a change in underlying parameters on which the value of an instrument or portfolio of financial instruments is dependent.

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## Herodotus

Herodotus (Ἡρόδοτος, Hêródotos) was a Greek historian who was born in Halicarnassus in the Persian Empire (modern-day Bodrum, Turkey) and lived in the fifth century BC (484– 425 BC), a contemporary of Thucydides, Socrates, and Euripides.

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## Isomer

An isomer (from Greek ἰσομερής, isomerès; isos.

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## Isotope geochemistry

Isotope geochemistry is an aspect of geology based upon the study of natural variations in the relative abundances of isotopes of various elements.

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## James David Forbes

James David Forbes (20 April 1809 – 31 December 1868) was a Scottish physicist and glaciologist who worked extensively on the conduction of heat and seismology.

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## John Dee

John Dee (13 July 1527 – 1608 or 1609) was an English mathematician, astronomer, astrologer, occult philosopher, and advisor to Queen Elizabeth I. He devoted much of his life to the study of alchemy, divination, and Hermetic philosophy.

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## Kronecker delta

In mathematics, the Kronecker delta (named after Leopold Kronecker) is a function of two variables, usually just non-negative integers.

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## Laplace operator

In mathematics, the Laplace operator or Laplacian is a differential operator given by the divergence of the gradient of a function on Euclidean space.

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## Latin

Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

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## Latin alphabet

The Latin alphabet or the Roman alphabet is a writing system originally used by the ancient Romans to write the Latin language.

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## Latin delta

Latin delta (ẟ) is a Latin letter similar in appearance to the Greek lowercase letter delta (δ), but derived from the handwritten Latin lowercase d. It is also known as "script d" or "insular d" and is used in medieval Welsh transcriptions for the sound (English th in this) represented by "dd" in Modern Welsh.

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## Limit of a function

Although the function (sin x)/x is not defined at zero, as x becomes closer and closer to zero, (sin x)/x becomes arbitrarily close to 1.

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## List of legal abbreviations

It is common practice in legal documents to cite to other publications by using standard abbreviations for the title of each source.

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## Locant

In organic chemistry, a locant is a figure to indicate the position of a functional group within a molecule.

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## Macroeconomics

Macroeconomics (from the Greek prefix makro- meaning "large" and economics) is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole.

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## Major seventh chord

In music, a major seventh chord is a seventh chord where the "third" note is a major third above the root, and the "seventh" note is a major seventh above the root (a fifth above the third note).

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## Mathematics

Mathematics (from Greek μάθημα máthēma, "knowledge, study, learning") is the study of such topics as quantity, structure, space, and change.

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## Modern Greek

Modern Greek (Νέα Ελληνικά or Νεοελληνική Γλώσσα "Neo-Hellenic", historically and colloquially also known as Ρωμαίικα "Romaic" or "Roman", and Γραικικά "Greek") refers to the dialects and varieties of the Greek language spoken in the modern era.

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## Nabla symbol

∇ The nabla symbol The nabla is a triangular symbol like an inverted Greek delta:Indeed, it is called anadelta (ανάδελτα) in Modern Greek.

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## Nile

The Nile River (النيل, Egyptian Arabic en-Nīl, Standard Arabic an-Nīl; ⲫⲓⲁⲣⲱ, P(h)iaro; Ancient Egyptian: Ḥ'pī and Jtrw; Biblical Hebrew:, Ha-Ye'or or, Ha-Shiḥor) is a major north-flowing river in northeastern Africa, and is commonly regarded as the longest river in the world, though some sources cite the Amazon River as the longest.

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## Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a magnetic field absorb and re-emit electromagnetic radiation.

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## Optical mineralogy

Optical mineralogy is the study of minerals and rocks by measuring their optical properties.

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## Organic compound

In chemistry, an organic compound is generally any chemical compound that contains carbon.

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## Partial charge

A partial charge is a non-integer charge value when measured in elementary charge units.

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## Partial derivative

In mathematics, a partial derivative of a function of several variables is its derivative with respect to one of those variables, with the others held constant (as opposed to the total derivative, in which all variables are allowed to vary).

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## Phoenician alphabet

The Phoenician alphabet, called by convention the Proto-Canaanite alphabet for inscriptions older than around 1050 BC, is the oldest verified alphabet.

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## Polynomial

In mathematics, a polynomial is an expression consisting of variables (also called indeterminates) and coefficients, that involves only the operations of addition, subtraction, multiplication, and non-negative integer exponents of variables.

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## Proceedings of the Royal Society

Proceedings of the Royal Society is the parent title of two scientific journals published by the Royal Society.

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## Proofreading

Proofreading is the reading of a galley proof or an electronic copy of a publication to detect and correct production errors of text or art.

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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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## River delta

A river delta is a landform that forms from deposition of sediment carried by a river as the flow leaves its mouth and enters slower-moving or stagnant water.

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## Romanization of Greek

Romanization of Greek is the transliteration (letter-mapping) or transcription (sound-mapping) of text from the Greek alphabet into the Latin alphabet.

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## Simplex

In geometry, a simplex (plural: simplexes or simplices) is a generalization of the notion of a triangle or tetrahedron to arbitrary dimensions.

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## Simplicial complex

In mathematics, a simplicial complex is a set composed of points, line segments, triangles, and their ''n''-dimensional counterparts (see illustration).

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## Solow–Swan model

The Solow–Swan model is an economic model of long-run economic growth set within the framework of neoclassical economics.

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## Symmetric difference

In mathematics, the symmetric difference, also known as the disjunctive union, of two sets is the set of elements which are in either of the sets and not in their intersection.

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## Th (digraph)

Th is a digraph in the Latin script.

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## Triangle

A triangle is a polygon with three edges and three vertices.

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## Uncertainty

Uncertainty has been called "an unintelligible expression without a straightforward description".

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## Uncertainty principle

In quantum mechanics, the uncertainty principle (also known as Heisenberg's uncertainty principle) is any of a variety of mathematical inequalities asserting a fundamental limit to the precision with which certain pairs of physical properties of a particle, known as complementary variables, such as position x and momentum p, can be known.

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## Vertex (graph theory)

In mathematics, and more specifically in graph theory, a vertex (plural vertices) or node is the fundamental unit of which graphs are formed: an undirected graph consists of a set of vertices and a set of edges (unordered pairs of vertices), while a directed graph consists of a set of vertices and a set of arcs (ordered pairs of vertices).

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## Voiced dental and alveolar stops

The voiced alveolar stop is a type of consonantal sound, used in some spoken languages.

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## Voiced dental fricative

The voiced dental fricative is a consonant sound used in some spoken languages.

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## Voltage

Voltage, electric potential difference, electric pressure or electric tension (formally denoted or, but more often simply as V or U, for instance in the context of Ohm's or Kirchhoff's circuit laws) is the difference in electric potential between two points.

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## Redirects here:

Delta (Greek letter), Delta (Greek), Delta letter, Delta sign, Thelta, \delta, Δ, Δέλτα, 𝛿.

## References

[1] https://en.wikipedia.org/wiki/Delta_(letter)