On the normal interval-valued fuzzy set space, this paper first give the definitions of their extension operations and orders by introducing the operations of interval numbers and t-norms operator, and then discuss basic properties with respect to their operations.

Thus, a conclusion is reached that the components of the 2 rank spherical noncancellation tensor operators are special linear combinations of the vector ladder operators tensor products.

This paper summarizes using tensor methods to solve nonlinear least squarequestion minf(x)and it s central to discuss the singlar question,proposes to use least square tensor method solving nonlinear least square singlarquestion,and discusses the existence of the solution in the tensor algorithm.