2 problems

Let $G$ be a countable group with Kazhdan property (T). LERF conjecture. The group $G$ is LERF if and only if it is finite. The preceding proposition establishes the corresponding…

Let $G$ be a countable group with Kazhdan property (T). Finiteness conjecture. The group $G$ is LERF if and only if it is finite. By the preceding proposition, for groups with prop…