# difference

## Information about difference

Difference is the contrary of equality, in particular of objects. Differences can only be stated on the basis of a comparison or categorization. Since a complete comparison of objects or things is seldom possible in practice, only relevant or defining attributes are used for stating equality or difference. Similar objects are only different with respect to attributes of minor discriminative value.

In order for something to be different, you must have something to compare it to.

In particular, difference can refer to:

Contrary may refer to:
• Contrary motion, in music theory
• Contrary Magazine, a literary journal founded at the University of Chicago
• Contrary (social role), in certain Amerindian cultures
• Contrary (comics), a character from Malibu Comics' Ultraverse

congruent if one can be transformed into the other by an isometry, i.e., a combination of translations, rotations and reflections. In less formal language, two sets are congruent if they have the same shape and size, but are in different positions (for instance one may be rotated,
A comparison is an evaluation of similarities and differences. See:
• Comparison (computer programming)
• Comparison (grammar)
• Comparative
• Three degrees of comparison

### Related articles

#### In mathematics

• Category theory

Categorization is the process in which ideas and objects are recognized, differentiated and understood. Categorization implies that objects are grouped into categories, usually for some specific purpose.
Relevant may refer to:
• The philosophical concept of relevance
• Relevant operator, a concept in physics, see renormalization group
• Relevance (law), a legal concept in the law of evidence
• Relevant, Ain, a commune of the Ain département in France

The word attribute can refer to:
• An attribute in philosophy, property, an abstraction of a characteristic of an entity or substance
• An attribute in art, an object that identifies a figure, most commonly referring to objects held by saints - see emblem

Similarity is some degree of symmetry in either analogy and resemblance between two or more concepts or objects. The notion of similarity rests either on exact or approximate repetitions of patterns in the compared items.
This article or section is written like a personal reflection or and may require .

Différance
A result is the final consequence of a sequence of actions or events (broadly incidents and accidents) expressed qualitatively or quantitatively, being a loss, injury, disadvantage, advantage, gain, victory or simply a value.
Subtraction is one of the four basic arithmetic operations; it is the inverse of addition. Subtraction is denoted by a minus sign in infix notation.

The traditional names for the parts of the formula
cb = a
are
In mathematics, a difference operator maps a function, f(x), to another function, f(x + a) − f(x + b).

The forward difference operator

A finite difference is a mathematical expression of the form f(x + b) − f(x + a). If a finite difference is divided by ba, one gets a difference quotient.
Percent Difference is the numerical interpretation of comparing two values with one another. The general requirement for selecting two values to be compared is that the user of this technique expects the two values to be numerically equivalent.
Set theory is the mathematical theory of sets, which represent collections of abstract objects. It encompasses the everyday notions, introduced in primary school, often as Venn diagrams, of collections of objects, and the elements of, and membership in, such collections.
In set theory and other branches of mathematics, two kinds of complements are defined, the relative complement and the absolute complement.

## Relative complement

If A and B are sets, then the relative complement of A in
In mathematics, the symmetric difference of two sets is the set of elements which are in one of the sets, but not in both. This operation is the set-theoretic equivalent of the exclusive disjunction (XOR operation) in Boolean logic.
inequality is a statement about the relative size or order of two objects. (See also: equality)
• The notation means that a is less than b and
• The notation means that a is greater than b.

computing is synonymous with counting and calculating. Originally, people that performed these functions were known as computers. Today it refers to a science and technology that deals with the computation and the manipulation of symbols.
Delta encoding is a way of storing or transmitting data in the form of differences between sequential data rather than complete files. Delta encoding is sometimes called delta compression, particularly where archival histories of changes are required (e.g.