严格的数学模型-FloW We are now ready to define flows more formally.Let G =(V.E)be a flow network with a capacity function c.Let s be the source of the network,and let t be the sink.A flow in G is a real-valued function f:Vx V->R that satisfies the following two properties: Capacity constraint: Flow conservation: When (u.v)E,there can be no flow from u to v,and f(u.v)=0. 2020/12/08严格的数学模型-Flow 2020/12/08 8