 It states that if a group "G" has cohomological dimension 2, then it has a 2-dimensional Eilenberg–MacLane space formula_1.For "n" different from 2, a group "G" of cohomological dimension "n" has an "n"-dimensional Eilenberg–MacLane space.It is also known that a group of cohomological dimension 2 has a 3-dimensional Eilenberg−MacLane space.