In the paper, for the first time, four distances for Circular Intuitionistic Fuzzy Sets (C-IFSs) are defined. These sets are extensions of the standard IFS that are extensions of Zadeh’s fuzzy sets. As it is shown, the distances for the C-IFS are different than those for the standard IFSs. At the moment, they do not have analogues in fuzzy sets theory. Examples, comparing the proposed distances, are given and some ideas for further research are formulated.

中文翻译：

---

圆形直觉模糊集的四个距离

在本文中，首次定义了圆形直觉模糊集（C-IFS）的四个距离。这些集合是对标准IFS的扩展，是对Zadeh模糊集合的扩展。如图所示，C-IFS的距离与标准IFS的距离不同。目前，他们还没有模糊集理论中的类似物。给出了示例，比较了建议的距离，并提出了一些进一步研究的思路。