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English
Noun
semiprojection (plural semiprojections)
- (mathematics) 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.
1997, Journal of the Association for Computing Machinery, page 544:We now show that closure under a semiprojection operation is not in general a sufficient condition for tractability.
2012, Janos Aczel, Aggregating clones, colors, equations, iterates, numbers, and tiles, page 13:Let f be the semiprojection defined by the bitransitive relation R. Then is a minimal clone.