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Things I wish I had learned at university: - measuring the efficiency of an algorithm in watts - difference between classical math and computation - relationship between geometry and number theory
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In practice it often depends on things like implementing your multiplication with a lookup table. I think the Landauer limit would matter if we did best effort computing and could harness the actual amount of determinism we can get from the substrate. We are far from that.
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Reversible computing builds on the realization that entropy results from deleting bits. By building gates that permute bits only, you may be more efficient (but you'll still have to flush out the superfluous bits at some point). Best effort computing is largely unrelated.
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