more precisely, the rank of every tensor in formula_43, where formula_40 is some indeterminate closed set in the zariski topology, is expected to equal the above value. for real tensors, formula_45 is the least rank that is expected to occur on a set of positive euclidean measure. the value formula_45 is often referred to as the expected generic rank of the tensor space formula_47 because it is only conjecturally correct. it is known that the true generic rank always satisfies