In this paper, firstly, we discuss the following matrix completion problem in spectral norm: ?(A B B* X)?2 < 1 subject to (A X) ? 0. The feasible condition for above is established, case, general positive semidefinite solution and its minimum rank are presented. Secondly, applying result of problem, also study approximation problem: ?A BXB*?2 A BXB* 0, where Cm?m?, Cm?n, X Cn?n?.

The attitude of human create pollution. Pollution has to be addressed, and changing attitudes could the only way mitigate three pillars method encourage humans change their so that our environment will at least maintain strata quo current situation. process is a long-term time- consuming process, however, end result an encouraging one. two examples quoted are River Life Project Sungai Way rehab...