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The proof of Theorem 1 in Moulay et al., (2022) is flawed; thus, it is unclear whether the proposed controller in that paper is capable of achieving the claimed result. [ABSTRACT FROM AUTHOR]

The aim of this article is to develop new second-order fixed-time sliding mode controllers able to tackle mismatched disturbances. Contrary to what is done in the literature, the proposed sliding-mode control strategy does not use disturbance observers because the sliding surface possesses robustness properties. The results are applied to define a new fixed-time differentiator. [ABSTRACT FROM AUTHOR]