In this paper the operator-valued martingale transform inequalities on mixed martingale Hardy spaces are proved. Some well-known results are generalized and unified. Applications are given to classical operators such as the maximal operator and the $ p $-variation operator of vector-valued martingales, and then we can very easily obtain some new vector-valued martingale inequalities in mixed martingale Hardy spaces. These inequalities are closely related to the geometrical properties of Banach spaces.
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