The Rademacher cotype-
constant 
of a bounded operator 
between Banach
spaces, for a real number 
, is the least nonnegative constant such that
 |
where 
denotes the expectation value, the inequality
holds for every finite sequence 
in 
, and the 
are independent
and identically distributed random variables
taking the values 
and 1 with equal probability. If no such constant
exists, 
(Talagrand 2021, p. 606). The operator 
has Rademacher cotype 
when 
. The Rademacher cotype of a Banach
space 
is the Rademacher cotype of its identity operator.
