Progress in mathematic model study for lake eutrophication .
湖泊富营养化数学模型研究进展。
Transaction cost economics ( tce ) has been widely criticized for its lack of adequate mathematic models , so modeling is imperative to tce .
交易成本经济学由于缺乏合适的数理模型而饱受批评，所以建模问题是交易成本经济学迫切需要解决的问题。
The original intention of paper is to carve out a new way based on mathematic model for city water supply price and offer an effective calculation way .
