Reducibility among Fractional Stability Problems

Reducibility Among Combinatorial Problems

Corrigendum: Space-Bounded Reducibility among Combinatorial Problems

1. 2. where I t has been pointed out that the S(')-bounded rudimentary predicates as given by Definition 6 of [1] do not possess the property asserted in the paragraph which starts on page 73 and ends on page 74. This may be corrected by replacing points 1, 2, and 3 of Definition 6 by the following: a(x, i, a) and ~ ( x , i, a) are in RUD s . I f c is a positive integer then both Q(x, u, v, w) ...

Sparse Variations and Reducibility among Prediction Problems Authors :

We investigate the relationship between two di erent notions of reducibility among prediction (learning) problems within the distribution-free learning model of Valiant (PAC learning model [7, 2].) The notions of reducibility we consider are the analogues for prediction problems of the many-one reducibility and of the Turing reducibility. The former is the notion of prediction preserving reduci...

Reducibility of Pointlike Problems

We show that the pointlike and the idempotent pointlike problems are reducible with respect to natural signatures in the following cases: the pseudovariety of all finite semigroups in which the order of every subgroup is a product of elements of a fixed set π of primes; the pseudovariety of all finite semigroups in which every regular J-class is the product of a rectangular band by a group from...

Reducibility among Scheduling Classes