Applied Analysis and Optimization, Volume 4, Number 3, 2020-Yokohama Publishers-

	Volume 5, Number 1, 2021 Contents
	Special Issue in Honor of the 80th Birthday of Prof. Hari Mohan Srivastava
	Preface: Gautam Srivastava, Jen-Chih Yao
	Sama Arjika and Mahaman Kabir Mahaman q-Difference equation for generalized trivariate q-Hahn polynomials
	K. Karthikeyan and M. Akila Existence results for abstract neutral functional differential equations with almost sectorial operators
	Mohammad Izadi and Carlo Cattani Solution of nonlocal fractional-order boundary value problems by an effective accurate approximation method
	Paolo Emilio Ricci and Rekha Srivastava A note on multivariate pseudo-Chebyshev functions of fractional degree
	Tuhtasin Ergashev and Anvar Hasanov Appell hypergeometric function and its application to the potential theory for a generalized bi-axially symmetric elliptic equation
	Gurmeet Singh, Gaganpreet Kaur and Muhammad Arif Upper bound of fifth Hankel determinant for a class of analytic function
	Pushpalatha Mahalank and Ismail Naci Cangul Harmonic index of graphs with added edges
	Bhairaba Kumar Majhi, Pushpalatha Mahalank, Oya Cangul and Ismail Naci Cangul Topological indices of pentagonal chains
	Mohammad Ahmad Properties of bilateral mock theta functions of general order
	Dan Tian and Ji-Huan He A variational principle to a fractal Hunter-Saxton equation



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