TY - JOUR

T1 - Tensor products and relation quantales

AU - Erné, Marcel

AU - Picado, Jorge

PY - 2017/10/22

Y1 - 2017/10/22

N2 - A classical tensor product A⊗ B of complete lattices A and B, consisting of all down-sets in A× B that are join-closed in either coordinate, is isomorphic to the complete lattice Gal(A,B) of Galois maps from A to B, turning arbitrary joins into meets. We introduce more general kinds of tensor products for closure spaces and for posets. They have the expected universal property for bimorphisms (separately continuous maps or maps preserving restricted joins in the two components) into complete lattices. The appropriate ingredient for quantale constructions is here distributivity at the bottom, a generalization of pseudocomplementedness. We show that the truncated tensor product of a complete lattice B with itself becomes a quantale with the closure of the relation product as multiplication iff B is pseudocomplemented, and that the tensor product has a unit element iff B is atomistic. The pseudocomplemented complete lattices form a semicategory in which the hom-set between two objects is their tensor product. The largest subcategory of that semicategory has as objects the atomic boolean complete lattices, which is equivalent to the category of sets and relations. More general results are obtained for closure spaces and posets.

AB - A classical tensor product A⊗ B of complete lattices A and B, consisting of all down-sets in A× B that are join-closed in either coordinate, is isomorphic to the complete lattice Gal(A,B) of Galois maps from A to B, turning arbitrary joins into meets. We introduce more general kinds of tensor products for closure spaces and for posets. They have the expected universal property for bimorphisms (separately continuous maps or maps preserving restricted joins in the two components) into complete lattices. The appropriate ingredient for quantale constructions is here distributivity at the bottom, a generalization of pseudocomplementedness. We show that the truncated tensor product of a complete lattice B with itself becomes a quantale with the closure of the relation product as multiplication iff B is pseudocomplemented, and that the tensor product has a unit element iff B is atomistic. The pseudocomplemented complete lattices form a semicategory in which the hom-set between two objects is their tensor product. The largest subcategory of that semicategory has as objects the atomic boolean complete lattices, which is equivalent to the category of sets and relations. More general results are obtained for closure spaces and posets.

UR - http://www.scopus.com/inward/record.url?scp=85031936197&partnerID=8YFLogxK

U2 - 10.1007/s00012-017-0472-x

DO - 10.1007/s00012-017-0472-x

M3 - Article

AN - SCOPUS:85031936197

VL - 78

SP - 461

EP - 487

JO - Algebra universalis

JF - Algebra universalis

SN - 0002-5240

IS - 4

ER -