... meanthat the minimum is attained in a single point. In the case of degeneracy, as commonly present in the IMRT setting, the set of minimizers is a sizeable, high dimensional, closedand connected ... maps of a manually optimised 6 beam configuration, a 5, 6, and 7 beam direction optimised configuration, and a 11 field configuration consisting of the union of the 5 BDO and 6 BDO configurations. ... vanish by virtue of the opti-mality conditions and the above considerations followingeq. 7.A direct consequence of this conjecture is, that the sub-space of non-vanishing curvature of Hij(D*)...