Take the 2-minute tour ×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.

There is a large literature devoted to studying the inverses of diagonally dominant matrices. I'd like to know if there is information about a so-to-say opposite situation: we have a matrix $A$ and want to find conditions under which $A^{-1}$ will be diagonally dominant.

One case which has been studied is that of strictly ultrametric matrices whose inverses are known to be Stieltjes matrices. But what if the original matrix has some negative entries?

UPDT: References to two papers, as requested some time ago:

(1) Li, Yaotang; Liu, Xin; Yang, Xiaoying; Li, Chaoqian Some new lower bounds for the minimum eigenvalue of the Hadamard product of an M-matrix and its inverse. (English) [J] Electron. J. Linear Algebra 22, 630-643, electronic only (2011).

(2) Ostrowski, A.M. Note on bounds for determinants with dominant principal diagonal. (English) [J] Proc. Am. Math. Soc. 3, 26-30 (1952).

share|improve this question
1  
It would be helpful if you could provide references from the "large literature devoted to studying the inverses of diagonally dominant matrices." Perhaps by looking at common features of these inverse matrices, it will be easier to ascertain the sort of conditions under which a matrix $A$ will have a diagonally dominant inverse. –  Benjamin Dickman Aug 4 '12 at 17:10
    
After a long delay, I am adding two references... –  Felix Goldberg Sep 6 '12 at 14:16

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.