The concept of type has been used without … We have found the following five approaches to … one gives about a variable in a declaration. … @ Value Space. A type is defined by … topics [refs]. @ Behaviour. A type is defined … [ref]. @ Representation. A type is determined by the way that … [refs]. … @ Representation Plus Behaviour. A type is determined … in terms of a set of procedures operating … [refs]. We have been unable to use any of these approaches … practical goals … as well as the aesthetic goal of having …
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