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Type.Inheritance.and.Relational.Theory

上传者: 2019-06-26 18:51:41上传 PDF文件 10.56MB 热度 30次
Typeinheritanceisthatphenomenonaccordingtowhichwecansay,forexample,thateverysquareisalsoarectangle,andsopropertiesthatapplytorectanglesingeneralapplytosquaresinparticular.Inotherwords,squaresareasubtypeofrectangles,andrectanglesareasupertypeofsquares.Recognizingandactinguponsuch
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