Mathematics plays a crucial role in understanding the behavior of quantum systems in quantum mechanics by providing the framework for describing and predicting the properties of these systems. In quantum mechanics, complex mathematical concepts such as linear algebra, vector spaces, and probability theory are used to represent the state of a quantum system, calculate probabilities of different outcomes, and understand the dynamics of particles at the quantum level. Mathematical tools like Hamiltonians, wave functions, operators, and eigenvalues are indispensable for formulating quantum mechanical principles and solving problems related to quantum systems. Overall, mathematics provides a precise language and structure that allows physicists to analyze and interpret the complex behavior of quantum systems accurately.