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