A Background on unbalanced optimal transport

The conic formulation detailed in Section A.3 is obtained by performing the optimal transport on ( x, 0) Note that Liero et al. [2015] do not mention that this The proofs are detailed in Liero et al. [2015]. We first start with the existence of minimizers stated in Proposition 1. Thus it suffices to have relative compactness of the set of minimizers. There exists a Borel measurable bijection between the measures' supports It is the same proof as in the main body. We present in this section the proofs of the properties mentioned in Section 2. We refer to Section 2 In this section we frequently use the notion of marginal for neasures. We present in this section concepts and properties which are necessary for the proof of Theorem 1.