For a given , is the problem of determining if a set is mortal solvable? is solvable, is unknown, and is unsolvable.
Mortality Problem
See also
MortalExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Mortality Problem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/MortalityProblem.html