FIRST AND SECOND-ORDER OP TIMALITY CONDITIONS USING APPROXIMATIONS FOR VECTOR EQUILIBRIUM PROBLEMS WITH CONSTRAINTS by Phan Quốc Khánh, Lê Thanh Tùng

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Novel analytical superposed nonlinear wave structures for the eighth-order (3+1)-dimensional Kac-Wakimoto equation using improved modified extended tanh function method by Wafaa B. Rabie, Hamdy M. Ahmed, Taher A. Nofal, E. M. Mohamed

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Local existence for a general model of size-dependent population dynamics by Nobuyuki Kato, Hiroyuki Torikata

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Solutions of type rm for a class of singular equations by Abdullah Altin

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Parameters and solutions of linear and nonlinear oscillators by Rina Ling

Subjects: “…existence of solutions…”
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Exploring novel solitary wave phenomena in Klein–Gordon equation using $$\phi ^{6}$$ ϕ 6 model expansion method by Yasir A. Madani, Khidir Shaib Mohamed, Sadia Yasin, Sehrish Ramzan, Khaled Aldwoah, Mohammed Hassan

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Behavior of second order nonlinear differantial equations by Rina Ling

Subjects: “…boundedness and monotonicity of solutions.…”
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Sharp conditions for the existence of infinitely many positive solutions to $ q $-$ k $-Hessian equation and systems by Haitao Wan, Yongxiu Shi

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On the approximate solution of the Cauchy problem for the Helmholtz equation on the plane by Davron Juraev, Nazira Mammadzada, Praveen Agarwal, Shilpi Jain

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American children – the challenges they are facing and helpful solutions by Krystyna Nowak-Fabrykowski

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Stability problem of some nonlinear difference equations by Alaa E. Hamza, M. A. El-Sayed

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Nonoscillation theorems for functional differential equations of arbitrary order by John R. Graef, Myron K. Grammatikopoulos, Yuichi Kitamura, Takasi Kusano, Hiroshi Onose, Paul W. Spikes

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Periodic solutions of nonlinear differential equations by Xiaojing Yang

Subjects: “…Periodic solutions…”
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Convexity, boundedness, and almost periodicity for differential equations in Hillbert space by Jerome A. Goldstein

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PROCESS SOLUTIONS IN THE INTERACTION MANAGEMENT OF ENERGY SYSTEMS by G. Avetisayn, A. Raуchenko

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Innovative soliton solutions for a (2+1)-dimensional generalized KdV equation using two effective approaches by Ibrahim Alraddadi, Faisal Alsharif, Sandeep Malik, Hijaz Ahmad, Taha Radwan, Karim K. Ahmed

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Ranked solutions of the matric equation A1X1=A2X2 by A. Duane Porter, Nick Mousouris

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A phenomenological study of the challenges governing the issue of managing emotions in schools and providing solutions by Kamal Nosrati Heshi, Morteza Golshani Gehraz, Nasim Rezaei

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Global well-posedness for the 2D MHD equations with only vertical velocity damping term by Huan Long, Suhui Ye

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The influence of the rate of selenium crystallization from aqueous solutions on its morphology by Harañczyk I., Szafirska B., Fitzner K.

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