Items

• distributivity

  The Distributive Law says that multiplying a number by a group of numbers added together is the same as doing each multiplication separately.
• divergence

  Divergence is a vector operator that produces a scalar field, giving the quantity of a vector field's source at each point. More technically, the divergence represents the volume density of the outward flux of a vector field from an infinitesimal volume around a given point.
• divergence test

  It is a way to look at the limit of the terms of a series to tell if it diverges.
• divisible

  Containing another number a number of times without a remainder.
• division

  Division is one of the four basic operations of arithmetic, the others being addition, subtraction, and multiplication. The division of two natural numbers is the process of calculating the number of times one number is contained within another one.
• dodecagon

  A plane figure with twelve straight sides and angles.
• domain

  The set of values of the independent variable(s) for which a function or relation is defined. Typically, this is the set of x-values that give rise to real y-values
• dot product

  Is an algebraic operation that takes two equal-length sequences of numbers and returns a single number.
• double

  As a verb, to double means to multiply by two or to increase twofold.
• double integrals

  A double integral is defined as a limit of a Riemann sum.
• drag force

  The portion of the drag force that is due to the inertia of the fluid — the resistance that it has to being pushed aside — is called the pressure drag (or form drag, or profile drag). This is usually what someone is referring to when they talk about drag.
• dummy variable

  A variable appearing in an expression is a dummy variable if the letter being used could equally well be replaced by another letter
• eigenvalue

  Eigenvalues and eigenvectors. Geometrically, an eigenvector, corresponding to a real non-zero eigenvalue, points in a direction that is stretched by the transformation and the eigenvalue is the factor by which it is stretched. If the eigenvalue is negative, the direction is reversed.
• eigenvector

  The set of all eigenvectors of a linear transformation, each paired with its corresponding eigenvalue, is called the eigensystem of that transformation. The set of all eigenvectors of T corresponding to the same eigenvalue, together with the zero vector, is called an eigenspace or characteristic space of T.
• element

  In mathematics, an element, or member, of a set is any one of the distinct objects that make up that set.
• eliminate

  To eliminate means to completely remove, get rid of, or eradicate something.
• ellipse

  In mathematics, an ellipse is a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for every point on the curve. As such, it is a generalization of a circle, which is a special type of an ellipse having both focal points at the same location.
• empty set

  In mathematics, and more specifically set theory, the empty set or null set is the unique set having no elements / its size or cardinality is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set / in other theories, its existence can be deduced.
• equal sign

  The equal sign (=) is a mathematical symbol used to indicate that the expressions on both sides of it are equal. Important to note is that this symbol may not be used to indicate implicate or consequence.
• equiangular

  Having equal angles.
• equidistant

  At equal distances.
• equilateral

  Having all its sides of the same length
• equilibrium

  An equilibrium of a dynamical system is a value of the state variables where the state variables do not change. In other words, an equilibrium is a solution that does not change with time. To determine the values such that x n = E is an equilibrium of the dynamical system.
• error

  In applied mathematics, the difference between a true value and an estimate, or approximation, of that value. In statistics, a common example is the difference between the mean of an entire population and the mean of a sample drawn from that population.
• error function [erf(x)]

  In mathematics, the error function is a special function of sigmoid shape that occurs in probability, statistics, and partial differential equations describing diffusion.