but there’s a problem with the classical formulation. the derivative takes a regex and a character, so to build a state machine you need to compute it for every possible character to get all transitions from a given state. sure, you can compress the number of characters into equivalence classes before, but you still have to compute for each equivalence class - and many of them end up leading to the same state anyway. for example, the regex abc (below) cares about a, b, c, and “everything else”, which brings us down from 65536 to 4 in UTF-16, but for the first node (abc) even b and c behave the same as “everything else”. so what are we computing these for? in other words, there is something left to improve here.
. Once this is fitted we then need to program the MAC address and hostid. However, if we didn’t have a record of these we will have to make them up and just need to ensure sure that the MAC address doesn’t clash with that of another device on our network. The above linked FAQ has details of the hostid format, which has a prefix specific to the machine model, while the MAC address prefix is that assigned to Sun Microsystems.
。PDF资料对此有专业解读
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各世代的劃分方式一直存在激烈爭議。而依據益普索的報告，各世代的年齡區間界定如下：