Dear categorists, the following preprint is now available at http://arxiv.org/abs/1402.0253 : "Sequential multicategories" Abstract: "We study the monoidal closed category of symmetric multicategories, especially in relation with its cartesian structure and with sequential multicategories (whose arrows are sequences of concurrent arrows in a given category). Then we consider cartesian multicategories in a similar perspective and develop some peculiar items such as algebraic products. Several classical facts arise as a consequence of this analysis when some of the multicategories involved are representable." Among the topics discussed there are: 1) Promonoidal categories as exponentiable multicategories and particular instances of powers of multicategories. 2) Characterization of the sequential multicategories as those of commutative monoids in a symmetric multicategory and the sequential (co)reflection. 3) Characterization of the preadditive ( = cMon-enriched ) categories as those of commutative monoids in a cartesian multicategory and the preadditive coreflection. 4) Algebraic products in cartesian multicategories, generalizing algebraic biproducts in preadditive categories. Comments are welcome (for instance, maybe there are related works which I am not aware of). Best regards Claudio [For admin and other information see: http://www.mta.ca/~cat-dist/ ]