I'm reading the book Reasoning about uncertainty and having some problems with the notation.
$F = 2^W$ where $W$ is a set and $F$ an algebra.
What this mean?
2026-04-08 02:06:08.1775613968
What does $F = 2^W$ mean?
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Means the Power set.
i.e.
if $W = \{w_1, w_2, w_3\}$ then
$2^W = \{\emptyset,\{w_1\},\{w_2\},\{w_3\},\{w_1,w_2\},\{w_1,w_3\},\{w_2,w_3\},\{w_1,w_2,w_3\}\}$