PoIC : Pile of Index Cards

I have been thinking that my experience about information management can be expressed in a single equation. My experience about information (or a stuff) is,

• If a stuff is far from me, I don't access (dependency on spacial distance)
  
• I easily forget about a stuff (dependency on elapsed time)
  
• Frequency of access drastically decrease with space and time
  
• If I don't see a stuff, I forget it (dependency on visibility)
  

I assume they are represented as following simple equation,

where A is frequency of access (or just "accessibility"), V is visibility (0 <= V <= 1), x is spacial distance, and t is elapsed time.

In case you see it (V = 1)	In case you don't see it (V = 0.1)

This equation is visually understand through above two graphs. Assume you are at origin (x=0, t=0). Accessibility is maximum at the origin, and it decrease exponentially with spatial distance and elapsed time. The left graph is for V = 1, that is you see a stuff all time. Something just in front of you. Then the accessibility is the highest. The right graph is for V = 0.1, that is you don't see a stuff. For example, a stuff in a closed drawer. In this case, the accessibility is almost zero even though the stuff is spatially and temporally close to you.