Axiom:Axioms of Uncertainty/Axiom 4
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Axiom
Let $Z$ be a random variable.
Let $Z$ take the values $a_i$ with probability $p_i$, where $i \in \set {1, 2, \ldots, n}$.
Let $H_n: Z^n \to \R$ be a mapping which is to be defined as the uncertainty of $Z$.
${H_n}$ fulfils the following axiom:
- $\map {H_{n + 1} } {p_1, p_2, \ldots, p_n, 0} = \map {H_n} {p_1, p_2, \ldots, p_n}$
For example: a $7$-sided die which has no chance of showing a $7$, but is otherwise fair, has the same uncertainty as a fair $6$-sided die.
Sources
- 1988: Dominic Welsh: Codes and Cryptography ... (previous) ... (next): $\S 1$: Entropy = uncertainty = information: $1.1$ Uncertainty