congruence lattice

Which lattices occur as intervals in subgroup lattices of finite groups? ★★★★

Author(s):

Conjecture

There exists a finite lattice that is not an interval in the subgroup lattice of a finite group.

Posted by williamdemeo
updated February 22nd, 2011

Author(s):

Conjecture

There exists a finite lattice which is not the congruence lattice of a finite algebra.

Posted by williamdemeo
updated December 10th, 2010