eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences December 2009 21 3 709 712 jusps-A 1246 article G. BHUVANESWARI 1 Lecturer in Mathematics, (Guest), Ramanujan Research, Centre Government Arts College (Autonomous) , Kumbakonam - 612 001 Tamil Nadu (INDIA) <p>This article presents a matrix identity on the Secondary Schur Complement along with various applications.</p> https://www.ultrascientist.org/paper/1246/ Schur Complement Secondary Schur Complement LDU Factorization.