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A vortex (plural: vortices) is a flow pattern characterized by a rotating, swirling motion of fluid (which can be gas or liquid) around an axis. Vortices can occur in many different contexts, including in nature, engineering, and physics. Some key characteristics of vortices include: 1. **Rotation**: The fluid moves in a circular or spiral path around a central core or axis. The speed and direction of rotation can vary.

Arithmetic dynamics is a field of mathematics that combines elements of number theory and dynamical systems. It primarily studies the behavior of sequences of numbers defined by iterative processes, especially those arising from polynomial or rational functions.

Michael F. Crommie is a physicist known for his work in the field of condensed matter physics, particularly in the study of nanostructures and quantum materials. He is a professor of physics at the University of California, Berkeley, where he conducts research that includes topics such as scanning tunneling microscopy, nanotechnology, and the electronic properties of materials at the nanoscale.

Michael J. Leitch does not appear to be a widely recognized public figure based on the information available up to October 2023. It's possible that he may be a private individual, a professional in a specific field, or a less well-known figure in literature, academia, or another area.

N. Katherine Hayles is a prominent American literary critic, theorist, and professor known for her work at the intersection of literature, science, and technology. She is particularly recognized for her contributions to the fields of digital humanities, posthumanism, and media studies. Hayles has written extensively on topics such as the impact of digital technology on reading and writing, the nature of consciousness, and the relationship between literature and the sciences.

Complex dynamics is a branch of mathematics that studies the behavior of dynamical systems in the context of complex numbers. It typically involves the iteration of complex functions, particularly polynomials and rational functions, and explores the patterns and structures that emerge from these iterations. Key concepts in complex dynamics include: 1. **Iteration**: Complex dynamics often focuses on iterating a function, meaning applying the function repeatedly.