Define how coordinates define equivalences

[benkeks]

• [x] Define how expressiveness coordinates induce HMLsrbb-subsets and equivalences (i.e. Def. 7 minus the specific coordinates of Fig. 2.)
• [x] Show as example that $(\inf, 0,0,0,0,0,0,0)$ characterizes weak trace preoder/equivalence (cf. Ex. 4)
• [x] requires to define weak traces and to express how this leads to an equivalence