Binary mekso operator: uniform probability A(X_{2)u(X} for input (X_{1,X} where X_{1} is a number and X_{2} is a set or space. (See notes for details).

Establish (elsewhere) a universal set/topological space O and equip it with a measure L; then X_{1} must be an
element of O, and X_{2} must be a subset/subspace of O and will be equipped with/inherit the same measure L (restricted to it) and the appropriate topology. Let Y be the maximal non-discrete subset/subspace of X_{2} (in other words, all non-discrete subsets/subspaces of X_{2} are subsets/subspaces of Y). The term 'A' in the definition is a nonnegative-valued 'function' which is defined on the category of sets; it produces the proper normalization (by being the reciprocal of the integral of u over O with respect to L iff such is well-defined and finite and positive; otherwise, it is identically 0). The term 'u' in the definition is defined to be the sum of the indicator function (Kronecker delta) for Y (outputting 1 iff X_{1} is an element Y, and outputting 0 otherwise) and the Dirac delta of: 1 minus the indicator function for the relative complement of Y in X_{2} (id est: X_{2 \\ Y}); it should be noted that all functions mentioned are defined on all of O but have nonzero values according to only the previous description (in particular, u = 0 identically in O \\ X_{2}); the indicator functions directly are functions of the input X_{1}. See also: "zdeltakronekre", "zdeltadirake".