Abstract:
This paper considers multifunctions on two-elements set with superposition defined in a special way.
Set of all multifunctions contains set of Boolean functions, set of partial functions and set of hyperfunctions.
Clone of multifunctions is a set closed under superposition.
Interval $I(A,B)$ is a partially ordered by inclusion set of all subclones of $B$ containing $A$.
This paper describes a fragment of an interval in the lattice of clones containing all multifunctions preserving 0 and 1 (if
particular function simultaneously preserves 0 and 1 then it cannot have an empty set as a value on any input).
It is known that interval of partial Boolean functions preserving 0 and 1 consists of 45 clones.
This paper shows that considered interval contains 12 clones and has an isomorphic interval in the lattice of clones of partial functions.