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Channels, Dependence and What Cannot Be Recovered

What a noisy channel can carry per use, a dependence that correlation reports as zero and mutual information reports as a whole bit, and the theorem that says no amount of processing recovers what was destroyed.

IntermediateModule 330 min · 120 XP
A channel flipping bits at a rising error rate while its capacity curve falls to zero at one half, two inputs that individually say nothing about a target and jointly determine it, and a chain in which the information only ever drops.

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