- A
number is a
mathematical object used to count, measure, and label. The most
basic examples are the
natural numbers 1, 2, 3, 4, and so forth. Numbers...
- A
prime number (or a prime) is a
natural number greater than 1 that is not a
product of two
smaller natural numbers. A
natural number greater than 1 that...
- the
natural number following 19 and
preceding 21. A
group of
twenty units is
sometimes referred to as a score.
Twenty is a
composite number. It is also...
- The
International Standard Book
Number (ISBN) is a
numeric commercial book
identifier that is
intended to be unique.
Publishers purchase or
receive ISBNs...
- In mathematics, a
rational number is a
number that can be
expressed as the
quotient or
fraction p q {\displaystyle {\tfrac {p}{q}}} of two integers...
- In mathematics, a
complex number is an
element of a
number system that
extends the real
numbers with a
specific element denoted i,
called the imaginary...
-
natural number that
follows 41 and
precedes 43. 42 is a
pronic number, an
abundant number as well as a
highly abundant number, a
practical number, an admirable...
-
Number theory is a
branch of pure
mathematics devoted primarily to the
study of the
integers and
arithmetic functions.
German mathematician Carl Friedrich...
- the
number 1
differently than
larger numbers,
sometimes even not as a
number at all. Euclid, for example,
defined a unit
first and then a
number as a...
- A
binary number is a
number expressed in the base-2
numeral system or
binary numeral system, a
method for
representing numbers that uses only two symbols...