The n-ary algebra of tensors and of cubic and hypercubic matrices

Details The n-ary algebra of tensors and of cubic and hypercubic matrices The n-ary algebra of tensors and of cubic and hypercubic matrices

2009-02-16

arxiv.org/abs/0902.2757v2

Mathematics

Rings and Algebras

Scientific paper

We define a ternary product and more generally a (2k+1)-ary product on the vector space T^p_q(E) of tensors of type (p, q) that is contravariant of order p, covariant of order q and total order (p+q). This product is totally associative up to a permutation s_k of order k (we call this property a s_k-totally associativity). When p=2 and q=1, we obtain a (2k+1)-ary product on the space of bilinear maps on E with values on E, which is identified to the cubic matrices. Then we obtain a (2k+1)-ary product on the space of cubic matrices. If we call a l-matrix a square tableau with lx...xl entrances (if l=3 we have the cubic matrices and we speak about hypercubic matrices as soon as l >3), then the (2k+1)-ary product on T^p_q(E) gives a (2k+1)-product on the space of (p+q)-matrices. We describe also all these products which are s_k-totally associative. We compute the corresponding quadratic operads and their dual.

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