What provisions in a contract aren’t included in these categories? Provisions that set forth what the contract is about, referred to herein as the "operative provisions." For example, the operative provisions of a contract to sell the assets of a business would include a description of the assets, the calculation and method of payment of the purchase price, and the mechanics of transferring the assets. An asset sale contract containing only these operative provisions would be a very short document, legally enforceable, but not addressing many of the other important issues that buyers and sellers care about. What if there were a material problem with the assets that the buyer did not discover until the closing? 这些类别中不包括合同中的哪些条款？规定合同内容的条款，在此称为“执行条款”。例如，出售企业资产合同的执行条款将包括资产描述、购买价格的计算和支付方法以及资产转让机制。仅包含这些有效条款的资产销售合同将是一份非常简短的文件，具有法律强制执行力，但不能解决买卖双方关心的许多其他重要问题。如果买方在交割前未发现资产存在重大问题，该怎么办？