Hyper-dual group inverse: existence, characterizations, and applications
Motivated by the recent work of Xiao and Zhong [AIMS Math. 9 (2024), 35125--35150: MR4840882], we propose a generalized inverse for a hyper-dual matrix called hyper-dual group generalized inverse (HDGGI). Firstly, we characterize the existence of the HDGGI of a hyper-dual matrix and we show that it is unique, whenever exists. The HDGGI is then used to solve a linear hyper-dual system. We discuss the minimal $P$-norm least-squares properties of hyper-dual group inverse. We also exploit some sufficient conditions under which the reverse and forward-order laws for a particular form of the HDGGI and hyper-dual Moore-Penrose generalized inverse (HDMPGI) hold. Using the definition of dual matrix of order $n$, we finally establish necessary and sufficient condition for the existence of the group inverse of a dual matrix of order $n$.