Concatenation
The concatenation of two strings 
and 
is the string 
formed by joining and . Thus the concatenation of thestrings ``book'' and ``case'' is the string ``bookcase''. The concatenation of two strings and is often denoted, 
, or, in Mathematica
(Wolfram Research, Champaign, IL), 
. Concatenation is an associativeoperation, so that the concatenation of three or more strings, for example 
, 
, etc., is well-defined.
The concatenation of two or more numbers is the number formed by concatenating their numerals. For example, theconcatenation of 1, 234, and 5678 is 12345678. The value of the result depends on the numeric base, which is typicallyunderstood from context.
The formula for the concatenation of numbers 
and 
in base is
where
is the Length of
in base and 
is the Floor Function.See also Consecutive Number Sequences, Length (Number), Smarandache Sequences- Eutactic Star
- Evans Point
- Eve
- Even Function
- Even Number
- Eventually Periodic
- Everett Interpolation
- Everett's Formula
- Eversion
- Evolute
- Exact Covering System
- Exact Differential
- Exactly One
- Exactly When
- Exact Period
- Exact Trilinear Coordinates
- Excenter
- Excenter-Excenter Circle
- Excentral Triangle
- Excess
- Excess Coefficient
- Excessive Number
- Excircle
- Excision Axiom
- Excluded Middle Law