In 2020 some international conferences on Fractional Calculus (FC) and related topics have been held in a hybrid way mainly online via popular electronic platforms and by physical presence with reduced number of local participants. Despite of the pandemic situation, the FC community showed as usual great activities. In this special issue, we collected some of the plenary presentations and invited selected papers from the three international conferences (in order of their time table): – “WFC 2020: Workshop on Fractional Calculus”, Ghent University, Belgium, 9–10 June 2020; – “FCTFA 2020: Topics in Fractional Calculus and Time-frequency Analysis”, University of Novi Sad, Serbia, 16–17 June 2020; – “NSFDEA 2020: Numerical Solution of Fractional Differential Equations and Applications”, Sozopol, Bulgaria, 8– 11 September 2020. We remind some short information on these events. ——– WFC 2020: International Conference on Fractional Calculus Ghent University, Belgium, 9–10 June 2020 Workshop: Fractional Calculus

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FCAA 2020 年特别会议问题（FCAA–Volume 23–6–2020）

2020 年，一些关于分数阶微积分 (FC) 和相关主题的国际会议以混合方式举行，主要通过流行的电子平台在线举行，并减少了当地参与者的人数。尽管有大流行的情况，FC社区仍像往常一样表现出色。在本期特刊中，我们收集了部分全体会议的报告并邀请了来自三个国际会议的精选论文（按时间表排列）： – “WFC 2020: Workshop on Fractional Calculus”，比利时根特大学，6 月 9 日至 10 日2020 年；– “FCTFA 2020：分数微积分和时频分析主题”，塞尔维亚诺维萨德大学，2020 年 6 月 16 日至 17 日；– “NSFDEA 2020：分数阶微分方程及其应用的数值解”，保加利亚索佐波尔，2020 年 9 月 8 日至 11 日。我们提醒一些关于这些事件的简短信息。——– WFC 2020：分数阶微积分国际会议，比利时根特大学，2020 年 6 月 9-10 日研讨会：分数阶微积分