Uncountable
A set is uncountable
if there is no onetoone correspondence between the elements of
the set and the natural numbers. The set of real numbers is uncountable.
Union
The union
of two given sets A & B is the set of all elements that are
belonging to either A or B or both. For example,let A = (1, 5)
and B = (0, 6) be two open intervals of real numbers, then the union
of A and B is ,
which is the set of all real numbers between 1 and 6.
Unique
Being the only
value satisfying some condition.
Unique
factorization theorem
Another name
for the Fundamental Theorem of Arithmetic and it states that
any counting number is either a prime number or a composite number
that can be factored as a product of prime numbers in a unique way,
except for the order in which they are written.
Unit
The first position
in a placevalue counting system, representing a singledigit number.
Unknown
Indeterminate.
A letter whose value(s) is to be determined by solving an equation.
