S. Sivaramakrishnan's papers

Journal Papers

The maximum four point condition matrix of a tree (with Ali Azimi, Rakesh Jana and Mukesh K Nagar)
Linear Algebra and its Applications, Vol 691, Pages 133-150, 2024.
On the Min4PC Matrix of a Tree (with Ali Azimi, Rakesh Jana and Mukesh K Nagar)
American Journal of Combinatorics, Volume 3, Pages 13–21, 2024.
q-Enumeration of Type B and Type D Eulerian polynomials based on parity of descents (with Hiranya K. Dey and Umesh Shankar)
Enumerative Combinatorics and Applications, ECA 4:1, Article #S2R3, 2024.
On the alternating runs polynomial in type B and type D Coxeter groups (with Hiranya K. Dey)
Journal of the Ramanujan Math Society, Vol 38, Issue 3, pages 215-223, 2023.
Signed alternating descent enumeration in classical Weyl groups (with Hiranya K. Dey)
Discrete Mathematics, Vol 346, Issue 10, 2023, 113540.
The 2-Steiner distance matrix of a tree (with Ali Azimi)
Linear Algebra and its Applications, Vol 655, pages 65-86, 2022.
Eulerian central limit theorems and Carlitz identities in positive elements of classical Weyl groups (with Hiranya K. Dey)
Journal of Combinatorics, Vol 13(3), pages 333-356, 2022.
Inequalities among two rowed immanants of the q-Laplacian of trees and odd height peaks in generalized Dyck paths (with Arbind K. Lal and Mukesh K. Nagar)
Journal of Difference Equations and Applications, Vol 28, pages 198-221, 2022.
Generalized Matrix Polynomials of Tree Laplacians Indexed by Symmetric Functions and the GTS Poset (with Mukesh K. Nagar)
Séminaire Lotharingien de Combinatoire, B83a, 2021.
Gamma Positivity of the Excedance Based Eulerian Polynomial in Positive Elements of Classical Weyl Groups (with Hiranya K. Dey)
Annals of Combinatorics, Vol 24, pages 711-738, 2020.
Gamma positivity of the Descent based Eulerian polynomial in positive elements of Classical Weyl Groups (with Hiranya K. Dey)
The Electronic Journal of Combinatorics, #P3.20, 27(3), 2020.
Smith Normal Form of a distance matrix inspired by the four-point condition (with R. B. Bapat)
Linear Algebra and its Applications, Vol 603, pages 301--312, 2020.
Laplacian Immanantal polynomials and the GTS poset on Trees (with Mukesh K. Nagar)
Linear Algebra and its Applications, Vol 561, pages 1--23, 2019.
The Arithmetic Tutte polynomial of two matrices associated to Trees (with R. B. Bapat)
Special Matrices, Vol 6, pages 310--322, 2018.
Hook Immanantal and Hadamard inequalities for q-Laplacians of trees (with Mukesh K. Nagar)
Linear Algebra and its Applications, Vol 523, pages 131--151, 2017.
Enumerating excedances with linear characters in classical Weyl groups
Sèminaire Lotharingien de Combinatoire, B74c, 15 pages, 2016.
Squared distance matrix of a tree: inverse and inertia (with R. B. Bapat)
Linear Algebra and its Applications, Vol 491, pages 328--342, 2016.
The Smith normal form of product distance matrices (with R. B. Bapat)
Special Matrices, Vol 4, pages 46--55, 2016.
The second immanant of some combinatorial matrices (with R. B. Bapat)
Transactions on Combinatorics, article 30, Vol 4, Issue 2, pages 23--35, 2015.
Product distance matrix of a tree with matrix weights (with R. B. Bapat)
Linear Algebra and its Applications, vol 468, pages 145--153, 2015
Signed excedance enumeration in the hyperoctahedral group
The Electronic Journal of Combinatorics, Vol 21, Issue 2, P2.10, 16 pages, 2014.
Generic pole assignability, structurally constrained controllers and unimodular completion (with Madhu Belur and Rachel K. K.)
Linear Algebra and its Applns, vol 439, pages 4003--4022, 2013.
Product distance matrix of a graph and squared distance matrix of a tree (with R. B. Bapat)
Applicable Analysis and Discrete Mathematics, vol 7, pages 285--301, 2013.
The product distance matrix of a tree and a bivariate zeta function of a graph (with R. B. Bapat)
Electronic Journal of Linear Algebra, Vol 23, pages 275--286, 2012.
Identities for minors of the Laplacian, resistance and distance matrices (with R. B. Bapat)
Linear Algebra and its Applications, Vol 435, pages 1479--1489, 2011.
Inverse of the distance matrix of a block graph (with R. B. Bapat)
Linear and Multilinear Algebra, Vol 59, No. 12, pages 1393--1397, 2011.
Signed excedance enumeration via determinants
Advances in Applied Math, Vol 47, pages 783--794, 2011.
A q-analogue of Graham, Hoffman and Hosoya's Theorem
The Electronic Journal of Combinatorics, N21, vol 17(1), 2010
Hankel determinants of some sequences of polynomials
Sèminaire Lotharingien de Combinatoire, B63d, 2010.
q-analogs of distance matrices of 3-hypertrees
Linear Algebra and Applications, Volume 431, pages 1234--1248, 2009.
Average distance in graphs and eigenvalues
Discrete Mathematics, vol 309, pages 3458--3462, 2009
On the two variable distance enumerator of the Shi hyperplane arrangement
European Journal of Combinatorics, Vol 29, Issue 5, pages 1104--1111, July 2008.
On Complete Partitions of Graphs (with M. M. Halldórsson, G. Kortsarz and J. Radhakrishnan)
Combinatorica, Vol 27 (5), pages 519--550, 2007.
The polytope of degree partitions (with A. Bhattacharya and M. K. Srinivasan)
The Electronic Journal of Combinatorics, 13, #R46, 2006.
Approximating the Isoperimetric number of Strongly Regular Graphs
Electronic Journal of Linear Algebra, volume 13, pages 111--121, 2005.

Conference Papers

Optimal communication scheduling for iterative decoding of irregular codes (with H. Sharma, S. Patkar)
Twentieth National Conference on Communications (NCC), pp. 1-5, Feb 28-March 2, 2014, Kanpur, India
The third immanant of exponential distance matrices. (with R. B. Bapat)
Combinatorial matrix theory and generalized inverses of matrices, 33–40, Springer, New Delhi, 2013
On the hardness of Approximating Minimum Monopoly Problems. (with S. Mishra and J. Radhakrishnan)
In the proceedings of FST and TCS, pages 277-288, 2002.