The concept of one has many synonyms
The number one
One has sometimes not been considered a number in some cultures in the past (because it does not involve plurality). The number one is represented by the numeral 1. 1 is the first positive integer and the first positive odd number.Although 1 has been considered prime until the beginning of the 20th century (former definition: no divisors apart from 1 and itself, itself not necessarily distinct from 1) the unit (i.e. multiplicatively invertible element) 1 is now widely known as the empty product (defined as the multiplicative identity, i.e. 1) of primes, where an integer
Properties of 1
- Multiplicative identity (the empty product is defined as the multiplicative identity).
- Unit (has a multiplicative inverse) in any number set.
(the empty product, defined as the multiplicative identity).
0 0 = 0! = 1
The identity matrixThe
|n × n|
|I1 = |
, I2 =
, I3 =
, I4 =
, I5 =