Outer space (mathematics)
= Outer space (mathematics)
{wiki=Outer_space_(mathematics)}
In mathematics, "outer space" typically refers to a certain type of geometric space associated with free groups and their actions. The most common reference is to "Outer space" denoted as \\( \\mathcal\{O\}(F_n) \\), which is the space of marked metric graphs that correspond to the free group \\( F_n \\) of rank \\( n \\).