Abstract
In this chapter the mathematical foundations of statistics and stochastic processes are presented. Probability spaces, probability measures and densities as well as random variables are defined and examples for these mathematical structures in physics are given. The maximum entropy principle is presented as the basis to obtain a priori probabilities for a given problem. The central limit theorem is discussed and the theory of extreme value distributions is presented. For the theory of stochastic processes we focus on Markov processes and Martingales as these classes of processes underlie all applications discussed in later chapters. The master equation, the Fokker-Planck equation and Itô stochastic differential equations are discussed as the equations of motion for these processes.
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Notes
- 1.
Actually when information (or lack thereof) is measured in bits, the logarithm to basis 2 instead of the natural logarithm needs to be used, but this just leads to a constant shift in (2.20).
- 2.
Generally, ‘iff’ is taken to mean ‘if and only if’, a necessary and sufficient condition.
- 3.
A non-degenerate distribution is the opposite of a degenerate distribution. A distribution of a random variable is called degenerate, if it is a delta function, i.e., it is 1 for one value of the random variable and 0 otherwise. The corresponding cumulative distribution is the Heaviside step function.
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Paul, W., Baschnagel, J. (2013). A Brief Survey of the Mathematics of Probability Theory. In: Stochastic Processes. Springer, Heidelberg. https://doi.org/10.1007/978-3-319-00327-6_2
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