# A Lower Bound on the Complexity of Approximating the Entropy of a Markov Source - Computer Science > Information Theory

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Abstract: Suppose that, for any k \geq 1, \epsilon > 0 and sufficiently large$\sigma$, we are given a black box that allows us to sample characters from a$k$th-order Markov source over the alphabet \{0,

., \sigma - 1\}. Even ifwe know the source has entropy either 0 or at least \log \sigma - k, thereis still no algorithm that, with probability bounded away from 1 - 2, guessesthe entropy correctly after sampling at most \sigma - k^{k - 2 - \epsilon}characters.

Autor: Travis Gagie

Fuente: https://arxiv.org/