Meaning of semiprojection | Babel Free

Definitions

A function f of rank k, where k is greater than or equal to three, such that for some index i between one and k (inclusive), f(x₁, x₂, ... xₖ) = xᵢ whenever |{x₁, x₂, ... xₖ}| < k.

Examples

“We now show that closure under a semiprojection operation is not in general a sufficient condition for tractability.”

“Let f be the semiprojection defined by the bitransitive relation R. Then [f] is a minimal clone.”

CEFR level