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# Karl Petersen (UNC-CH), Ergodic Theory and Dynamical Systems Seminar

## September 20, 2016 @ 3:30 pm - 5:00 pm

**Title: **Guessing the present from observations at random times in the future

**Abstract:** In order to try to understand average information obtained from measurements made at random times, we consider very simple Markov chains, and even a switch of two points, observed only whenever a coin flip comes up heads. The basic ideas of entropy and conditioning that come up are explained as needed.