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Black holes; event; isolated and dynamical horizons; Raychaudhuri equation.

Basic features of dynamical black holes in full, non-linear general relativity are summarized in a pedagogical fashion. Qualitative properties of the evolution of various horizons follow directly from the celebrated Raychaudhuri equation.

Abhay Ashtekar^{1 2}

1. Institute for Gravitational Physics and Geometry, Physics Department, Penn State University, University Park, PA 16802, USA
2. Institute for Theoretical Physics, University of Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands