The present study is an attempt to explore the effect of one of the pragmatic elements of discourse (namely the conceptualizable agent) on overpassivization of English unaccusative verbs. Through employing the questionnaire originally used by Ju, (2000), 206 Iranian intermediate and advanced English majors were asked to choose the more grammatical form (active or passive) in target sentences wi...

MOTIVATION Many practical pattern recognition problems require non-negativity constraints. For example, pixels in digital images and chemical concentrations in bioinformatics are non-negative. Sparse non-negative matrix factorizations (NMFs) are useful when the degree of sparseness in the non-negative basis matrix or the non-negative coefficient matrix in an NMF needs to be controlled in approx...

The 2-adic valuations of sequences counting the number of alternating sign matrices of size n and the number of totally symmetric plane partitions are shown to be related in a simple manner.