\Dg [q(g,b),t] \aNul (1,-1) \aMapsto (2,-4) &&& \rMapsto &&& q(g,\phi (b,t)) \aNul (-1,-1) \aMapsto (-2,-4) \mx {12pt} \\ & \M R_s & & \rTo & & \beta \inv (W_s) \\ & & \rdTo & & \ldTo >{R_s} \\ & & & \beta \inv \orlz {s} \\ & & q(g,r_s(b)) & {} = {} & q(g,r_s(\phi (b,t))) \\ \endDg