Perfect type of n-tensors

In various application fields, tensor type data are used recently and then a typical rank is important. Although there may be more than one typical ranks over the real number field, a generic rank over the complex number field is the minimum number of them. The set of $n$-tensors of type $p_1\times p_2\times\cdots\times p_n$iscalledperfect,ifithasatypicalrank$\max(p_1,\ldots,p_n)$\mathrm{.}Inthispaper,wedetermineperfecttypesof$n$-tensor.