%0 Journal Article %A Jun Luo %D 2013 %J International Journal of Mathematical and Computational Sciences %B World Academy of Science, Engineering and Technology %I Open Science Index 76, 2013 %T Construction Methods for Sign Patterns Allowing Nilpotence of Index k %U https://publications.waset.org/pdf/9996944 %V 76 %X In this paper, the smallest such integer k is called by the index (of nilpotence) of B such that Bk = 0. In this paper, we study sign patterns allowing nilpotence of index k and obtain four methods to construct sign patterns allowing nilpotence of index at most k, which generalizes some recent results. %P 720 - 724