Shepard et al. considered Boolean concepts defined over three features with four positive and four negative examples. Such concepts fall into six logical types, designated I–VI (the SHJ types).

Beronika Daxner, Antoine Genitrini, Bernhard Gittenberger, Cécile Mailler, THE RELATION BETWEEN TREE SIZE COMPLEXITY AND PROBABILITY FOR BOOLEAN FUNCTIONS GENERATED BY UNIFORM RANDOM TREES, Applicable ...