Search results
Results from the Health.Zone Content Network
Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets (natural numbers), (integers), (rational numbers), (real numbers), and (complex ...
The blackboard bold typeface is widely used for denoting the basic number systems. These systems are often also denoted by the corresponding uppercase bold letter. A clear advantage of blackboard bold is that these symbols cannot be confused with anything else. This allows using them in any area of mathematics, without having to recall their ...
Since then, blackboard bold has gradually gained currency, and is now commonly used in mathematical printing to denote certain common objects in a style distinct from other uses of bold letters. Today, either blackboard bold or ordinary bold letters can be used interchangeably to represent the standard number systems (,,,,,) and for certain ...
The natural numbers form a set, commonly symbolized as a bold N or blackboard bold . Many other number sets are built from the natural numbers. For example, the integers are made by adding 0 and negative numbers.
The set of real numbers, sometimes called "the reals", is traditionally denoted by a bold R, often using blackboard bold, . [2] [3] The adjective real, used in the 17th century by René Descartes, distinguishes real numbers from imaginary numbers such as the square roots of −1. [4]
The octonions can be thought of as octets (or 8 tuples) of real numbers. Every octonion is a real linear combination of the unit octonions: where e0 is the scalar or real element; it may be identified with the real number 1 . That is, every octonion x can be written in the form. with real coefficients xi.
For example, is a rational number, as is every integer (for example, =). The set of all rational numbers, also referred to as " the rationals ", [ 2 ] the field of rationals [ 3 ] or the field of rational numbers is usually denoted by boldface Q , or blackboard bold Q . {\displaystyle \mathbb {Q} .}
Many letters of the Latin alphabet, both capital and small, are used in mathematics, science, and engineering to denote by convention specific or abstracted constants, variables of a certain type, units, multipliers, or physical entities. Certain letters, when combined with special formatting, take on special meaning.