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A recent post inspired me to post this.

This is the best description of entropy and information I've read.

Most of all, it highlights the subjective / relative foundations of these concepts.

Entropy and Information only exist relative to a decision about the set of state an observer cares to distinguish.

It also caused me to change my informal definition of entropy from a negative ("disorder)" to a more positive one ("the number of things I might care to know")

The Second Law now tells me that the number of interesting things I don't know about is always increasing!




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