An array 
, 
of positive integers
is called an interspersion if
1. The rows of 
comprise a partition of the positive
integers,
2. Every row of 
is an increasing sequence,
3. Every column of 
is a (possibly finite) increasing
sequence,
4. If 
and 
are distinct rows of 
and if 
and 
are any indices for which 
, then 
.
If an array 
is an interspersion, then it is a sequence dispersion.
If an array 
is an interspersion, then the sequence 
given by 
for some 
is a fractal sequence.
Examples of interspersion are the Stolarsky array
and Wythoff array.
