Taxonomy of Problems

 
click, swipe or press → to begin
picture of
picture of "problem about which it is impossible to find out if it can be solved or not", black background

unsolved

Unsolved problems are problems for which we neither have a solution, nor know whether such solution can be found.

solvable

P is solvable if, at some point in time, a proof will be provided that solution to P can be found.

unsolvable

P is unsolvable if, at some point in time, a proof will be provided that P does not have solution.
illustration of
illustration of "unsolvable and undecidable problem which leads to madness", black background

fatal

Problem P is "fatal" if no proof could ever be provided whether P is solvable or unsolvable. 

It is impossible to tell about problem if it is "fatal". That's why it is fatal ;)