Delta (letter)

Delta (upside down '''A''', uppercase '''Δ''', lowercase '''δ''') is the fourth letter of the Greek Alphabet . In the system of Greek Numerals it has a value of 4. It was derived from the Phoenician Letter Dalet . Letters that arose from Delta include the Latin D and the equivalent in the Cyrillic Alphabet Д .

In Modern Greek it represents a Voiced Dental Fricative , (like the th in the English word ''th''is) but in the Ancient Greek language, it represented a Voiced Dental Plosive .

A River Delta is named after the letter delta because it has roughly the triangular shape of the upper-case delta.

The upper-case letter Δ can be used to denote:

The Difference Operator , effecting a change or difference between mathematical values:

{y_2-y_1\over x_2-x_1} = {\Delta y \over \Delta x}

By extension of the above, Change generally, a use which shows up frequently in medical charts.

The Laplace Operator :

\Delta f = \sum_{i=1}^n {rac{\partial^2}{\partial x_i^2}}

The Discriminant of the Quadratic Equation :

\Delta = b^2 - 4ac\,\!

A Macroscopic Change in the value of a variable in mathematics or science.

Any of the Delta Particles in particle physics.

That an associated Locant number represents the location of a Covalent Bond in an Organic Compound , the position of which is variant between Isomeric forms.

In Legal Shorthand , it represents a Defendant .

In Genetics , it can stand for a Gene Deletion , e.g. the CCR5-Δ32 a deletion of the CCR5 at the 32nd bp segment.

In medical shorthand, it can stand for change of any type.

The lower-case letter δ can be used to denote:

An Infinitesimal Change in the value of a variable in mathematics or science.

An auxiliary function in Calculus used to rigorously define the Limit or Continuity of a given function.

The Kronecker Delta in mathematics.

The Dirac Delta Function in mathematics.

Deflection in engineering mechanics

Text requiring deletion in Proofreading . The usage is said to date back to classical times.

The relative Electronegativity of different atoms in a molecule, δ⁻ being more electronegative than δ⁺.

In some of the manuscripts written by Dr. John Dee , the character of delta is used to represent Dee.

The Transition Function in Automata .

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Information About

Delta (letter)