Existence and uniqueness of solution for a class of nonlinear sequential differential equations of fractional order

Open Mathematics is a fully peer-reviewed, open access, electronic journal that publishes significant, original and relevant works in all areas of mathematics. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, no space constraints and quick publication after the acceptance.
Open Mathematics is listed inter alia by Clarivate Analytics (formerly Thomson Reuters) - Current Contents/Physical, Chemical and Earth Sciences, JCR and SCIE. Our standard policy requires each paper to be reviewed by at least two Referees and the peer-review process is single-blind.

The journal aims at presenting high-impact and relevant research on topics across the full span of mathematics. Coverage includes:

• Algebra
• Algebraic Geometry
• Category Theory
• Complex Analysis
• Control Theory and Optimization
• Differential Equations
• Differential Geometry
• Discrete Mathematics
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• Geometry
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Special Issues:

• Fractional Problems with Variable-Order or Variable Exponents
  GUEST EDITORS:
  Jiabin Zuo, Jilin Engineering Normal University and Hohai University, China
  Debajyoti Choudhuri, National Institute of Technology Rourkela, India
  ADVISORY EDITOR:
  J. Vanterler da C. Sousa, University of Campinas, Campinas, Brazil
• Based on the 5th International Conference on Mechanics, Mathematics and Applied Physics (ICMMAP 2021)
  GUEST EDITORS:
  Quanxin Zhu, Hunan Normal University, China
  Bao Wang, Xuzhou Institute of Technology, China
  T. Saravanakumar, Institute of Mathematics, VAST, Vietnam
• Evolution Equations, Theory and Applications
  GUEST EDITORS:
  Bessem Samet, King Saud University, Riyadh, Saudi Arabia
  Calogero Vetro, University of Palermo, Italy
• Data Mining and Applications
  GUEST EDITORS:
  Cai Tay, Shanghai Jiao Tong University, China
  Darren Jones, INWASCON, Malaysia
  ADVISORY EDITOR:
  Ioannis Dimitriou, University of Patras, Greece
• Boundary Value Problems and their Applications on Biosciences and Engineering
  GUEST EDITORS:
  Salah Boulaaras, Qassim University, Kingdom of Saudi Arabia
  Mohamed Abdalla, King Khalid University, Saudi Arabia
  Baowei Feng, Southwestern University of Finance and Economics, Sichuan, P. R. China
  Aldo Jonathan Munoz-Vazquez, Engineering College, Texas A&M University, USA