#Math friends: what is the name of the property of a set such that no member of the set is larger than all the other members combined?

#Math friends: what is the name of the property of a set such that no member of the set is larger than all the other members combined?
{1, 3, 500} does not have this property; {3, 4, 5} does.
Assuming some way to compare members and some way to combine them.

beaware@social.beaware.livereplied to evan@cosocial.ca last edited by
@evan I am not a math person either but with my mix of Google experience along with slight help from AI, maybe Ultrametric Space would be correct?
It's a type of triangle inequality that seems to might possibly be what you're looking for.