Two path-connected topological spaces are sometimes called "commensurable" if they have homeomorphic finite-sheeted covering spaces. If two groups are (abstractly) commensurable, then they are quasi-isometric. Life cycle assessment is a powerful tool for analyzing commensurable aspects of quantifiable systems. Further, every resultant is clearly traceable in its components, because these are homogeneous and commensurable. More generally, a subgroup commensurable to a lattice is a lattice. Two groups are virtually equal if and only if they are commensurable. All powers of "x" must have the same dimension for the terms to be commensurable. Money thus allows for the association of different goods and makes them "commensurable". The components of the vector are commensurable (in duration). If two spaces are commensurable, then their fundamental groups are commensurable. Example&colon; any two closed surfaces of genus at least 2 are commensurable with each other. By taking on a general quality of exchange value, they become commensurable. An arithmetic group means any subgroup of "G"(Q) that is commensurable with "G"(Z).