3 ms·

To repeat even more tersely, the fraction of information you have about a system can only go spontaneously down, never up. Knowing less is free, learning is at

To repeat even more tersely, the fraction of information you have about a system can only go spontaneously down, never up. Knowing less is free, learning is at cost.

lisper 4y ago
That is brilliant. Is that your idea, or did you get it from somewhere?
- IIAOPSW 4y ago
  Mine.
  - lisper 4y ago
    Cool. I would like to use this idea and credit you but you have no identity info in your profile. Shall I just credit this to your handle, IIAOPSW?
    - IIAOPSW 4y ago
      Do me a favor, credit it to Euler.
- krastanov 4y ago
  It is the notion behind "Completely Positive Trace Preserving" maps. It is used a lot in quantum information and quantum computing. It is present by other names in other situations.