integer
the set of integers, denoted by 
, represents whole numbers (numbers without fractions), 
.
, represents whole numbers (numbers without fractions), .
the integers 
is the set 
where each number is 1 away from the set.
[cite:;taken from @analysis_cummings_2019 chapter 1 the reals]
[cite:@analysis_cummings_2019] contains a rigorous construction of the integers. is the set where each number is 1 away from the set.[cite:;taken from @analysis_cummings_2019 chapter 1 the reals]