It is our pleasure to announce in this issue of Digestive Diseases and Sciences an exciting new collaboration with SIRC (Società Itialiana di Ricerche in Chirurgia). Due to the graciousness of the SIRC Board, keen to collaborate with DDS by a decision made during a meeting held in Rome in October 2018, we are pleased to take this first step with the following new case feature.
The analysis of singular solutions in optimal control problems is addressed. The case of systems with two inputs is investigated characterising all the possible combination of singular arcs and constant boundary values. It is described the extension to a two input system of a previously proposed procedure for computing the control along the singular arcs in a state feedback form for one input dynamics. The procedure makes use of the possibility of computation in an analytical form of the costate as a function of the state.
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