decimal representation
This notation can be extended to enable any positive real number to be written as
using, for the integer part, the normal representation cncn−1…c1c0 to base 10 (see base). If, from some stage on, the representation consists of the repetition of a string of one or more digits, it is called a recurring or repeating decimal. For example, the recurring decimal 0.12748748748…can be written as 
or as 
, where the dots above indicate the beginning and end of the repeating string. If the repeating string consists of a single zero, this is generally omitted and the representation is called a terminating decimal.
The decimal representation of any real number is unique except for terminating decimals which have two expansions, as with 0.25 and 
. The numbers that can be expressed as recurring (including terminating) decimals are precisely the rational numbers.
- strong law of large numbers
- structuralism
- Structure Theorem
- strut
- Student
- Student's t-distribution
- Sturm–Liouville equation
- subadditive
- subdivision
- subdivision
- subdivision
- subfield
- subgraph
- subgroup
- subgroup generated by a set
- subject
- submatrix
- subring
- subscript
- subsequence
- subset
- subspace
- subspace topology
- substitution
- substitution group