Abstract:
The notion of the spectrum of the Boolean function $f$ of $n$ variables is defined, its properties are investigated. The stochastic case is considered also under the assumption that the function $f$ has the uniform distribution on the set $F_n = \{f\}$ of all Boolean functions of $n$ variables.
Key words:Boolean function, Walsh–Hadamard transform, the spectrum of a Boolean function, structure of the spectrum, structure distribution, limit theorems.