Ratnasingham Shivaji

Ratnasingham Shivaji is an American mathematician, focusing on applied mathematics and mathematical biology, currently the H. Barton Excellence Professor at University of North Carolina at Greensboro and formerly a W. L. Giles Distinguished Professor at Mississippi State University.

Shivaji completed his undergraduate studies at the University of Peradeniya, Sri Lanka, in 1977, graduating with a First-Class degree.

He was included in the 2019 class of fellows of the American Mathematical Society "for contributions to the theory of semipositone elliptic questions applied to reaction-diffusion systems, for mentoring, and for providing leadership for the inception of a doctoral program in mathematics". Provided by Wikipedia
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  1. 1
    Uniqueness of positive solutions for cooperative Hamiltonian elliptic systems

    Uniqueness of positive solutions for cooperative Hamiltonian elliptic systems by Junping Shi, Ratnasingham Shivaji

    Published 2016-03-01
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  2. 2
    Halo-shaped bifurcation curves in ecological systems

    Halo-shaped bifurcation curves in ecological systems by Jerome Goddard II, Ratnasingham Shivaji

    Published 2014-04-01
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  3. 3
    A study of logistic growth models influenced by the exterior matrix hostility and grazing in an interior patch

    A study of logistic growth models influenced by the exterior matrix hostility and grazing in an interior patch by Nalin Fonseka, Jonathan Machado, Ratnasingham Shivaji

    Published 2020-03-01
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  4. 4
    Existence results for a class of $p$–$q$ Laplacian semipositone boundary value problems

    Existence results for a class of $p$–$q$ Laplacian semipositone boundary value problems by Ujjal Das, Amila Muthunayake, Ratnasingham Shivaji

    Published 2020-12-01
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  5. 5
    Ananta Acharya, Ujjal Das, Ratnasingham Shivaji

    Ananta Acharya, Ujjal Das, Ratnasingham Shivaji by Ananta Acharya, Ujjal Das, Ratnasingham Shivaji

    Published 2022-01-01
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  6. 6
    S-shaped bifurcation curves for logistic growth and weak Allee effect growth models with grazing on an interior patch

    S-shaped bifurcation curves for logistic growth and weak Allee effect growth models with grazing on an interior patch by Dagny Butler, Ratnasingham Shivaji, Anna Tuck

    Published 2013-10-01
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  7. 7
    An infinite semipositone problem with a reversed S-shaped bifurcation curve

    An infinite semipositone problem with a reversed S-shaped bifurcation curve by Amila Muthunayake, Cac Phan, Ratnasingham Shivaji

    Published 2023-01-01
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  8. 8
    Logistic equation with the p-Laplacian and constant yield harvesting

    Logistic equation with the p-Laplacian and constant yield harvesting by Shobha Oruganti, Junping Shi, Ratnasingham Shivaji

    Published 2004-01-01
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  9. 9
    Influence of singular weights on the asymptotic behavior of positive solutions for classes of quasilinear equations

    Influence of singular weights on the asymptotic behavior of positive solutions for classes of quasilinear equations by Maya Chhetri, Pavel Drábek, Ratnasingham Shivaji

    Published 2020-12-01
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  10. 10
    Existence of three solutions for a two-point singular boundary-value problem with an unbounded weight

    Existence of three solutions for a two-point singular boundary-value problem with an unbounded weight by Dhany Rajendran, Eunkyung Ko, Ratnasingham Shivaji

    Published 2016-03-01
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  11. 11
    Subsolutions: A journey from positone to infinite semipositone problems

    Subsolutions: A journey from positone to infinite semipositone problems by Eun Kyoung Lee, Ratnasingham Shivaji, Jinglong Ye

    Published 2009-04-01
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  12. 12
    On S-shaped and reversed S-shaped bifurcation curves for singular problems

    On S-shaped and reversed S-shaped bifurcation curves for singular problems by Eunkyung Ko, EUN KYOUNG LEE, Ratnasingham Shivaji

    Published 2011-04-01
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  13. 13
    Positive solutions for classes of multiparameter elliptic semipositone problems

    Positive solutions for classes of multiparameter elliptic semipositone problems by Sumalee Unsurangsie, Ratnasingham Shivaji, Alfonso Castro, Scott Caldwell

    Published 2007-06-01
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  14. 14
    Bifurcation curves for singular and nonsingular problems with nonlinear boundary conditions

    Bifurcation curves for singular and nonsingular problems with nonlinear boundary conditions by Jerome Goddard, Quinn Morris, Ratnasingham Shivaji, Byungjae Son

    Published 2018-01-01
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  15. 15
    An exact bifurcation diagram for a $p$–$q$ Laplacian boundary value problem

    An exact bifurcation diagram for a $p$–$q$ Laplacian boundary value problem by Ananta Acharya, Victor Munoz, Dustin Nichols, Ratnasingham Shivaji

    Published 2023-03-01
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  16. 16
    Infinite semipositone problems with a falling zero and nonlinear boundary conditions

    Infinite semipositone problems with a falling zero and nonlinear boundary conditions by Mohan Mallick, Lakshmi Sankar, Ratnasingham Shivaji, Subbiah Sundar

    Published 2018-11-01
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  17. 17
    Density‐dependent within‐patch movement behavior of two competing species

    Density‐dependent within‐patch movement behavior of two competing species by James T. Cronin, Jerome Goddard II, Aaron Krivchenia, Ratnasingham Shivaji

    Published 2023-11-01
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  18. 18
    Effects of Predation-Induced Emigration on a Landscape Ecological Model

    Effects of Predation-Induced Emigration on a Landscape Ecological Model by James T. Cronin, Nalin Fonseka, Jerome Goddard, Ratnasingham Shivaji, Xiaohuan Xue

    Published 2025-01-01
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  19. 19
    An exact bifurcation diagram for a reaction–diffusion equation arising in population dynamics

    An exact bifurcation diagram for a reaction–diffusion equation arising in population dynamics by Jerome Goddard II, Quinn A. Morris, Stephen B. Robinson, Ratnasingham Shivaji

    Published 2018-11-01
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  20. 20
    Modeling the effects of density dependent emigration, weak Allee effects, and matrix hostility on patch-level population persistence

    Modeling the effects of density dependent emigration, weak Allee effects, and matrix hostility on patch-level population persistence by James T. Cronin, Nalin Fonseka, Jerome Goddard II, Jackson Leonard, Ratnasingham Shivaji

    Published 2020-01-01
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