“…References to be included are [10], [30], [36], [35], [48]. Two subspaces are called transverse if they span the given vector space, and, following [6, p. 21], we define a Lagrangian bisection of a symplectic vector space V as a pair of transverse Lagrangian subspaces L, L ′ ; then automatically L∔L ′ = V .…”