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There exists a large variety of applications, for instance in estimation and detection as well as network optimization, that involve both integer (discrete) decision making andthe optimization of continuous parameters. The integer decision making requirementsusually stem from the nature of the problem. In many applications, the physical quantitiesto be optimized are naturally undividable. Think for example of a cellular networkin which a subset of users needs to be selected for transmission. For a given user aconnection is either established or not.