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故事实在没办法编了,手头的活太多,压在脑子里面几篇BLOG还没写,写到一半的BLOG也压在电脑里面。去中关村的时候,鼎好的二期工程快竣工了,看到旁边的四通大厦,突然想到凌志军说的,中关村都知道四通,都不知道四通在做什么。配置了两天的php+mysql环境,发现自己老早以前安装的一堆古董,忘了。书上总是遮遮掩掩,当然也自有其道理,比如写经济史,跳过89年似乎也没什么大问题。到头来,却搞得知道西单民主墙的80年代都没几个了。90年代的关键词是赚钱,人们修大厦,断掉了现金流,然后AMD买ATI,也弄得很尴尬。Intel终于用起来了nVidia的显卡。
还是几天假期初的时候,晚上3点多,写的烂尾文:
宇宙信息量有限实在是一个很鼓舞人心的想法。
我们可以据此推断出一些很有意思的东西。想像存在这样的一个预言机器,它根据现在世界的状态能够推算出世界下一刻的状态。一个有意思的现象是,假设宇宙现在的状态是W,下一刻的状态是W~,预言机器现在的状态是A,下一刻的状态是A~。那么可以推断,W≥A=W~。若E()代表信息量,那么E(W)≥E(W~)。很显然这里是个大于等于号,如果是小于号,那么意味这预言机器包含有比宇宙多的信息量,而宇宙当前的状态包含了预言机器的状态,所以这一推论不成立。这说明,宇宙要么是在保持着初始的信息量,要么是在不断丢失信息。如果是在不断丢失信息,那么就会有一天,宇宙的信息量归于零。信息量归于零意味着什么呢,就是到某个时候,宇宙的每一刻都已经知道,不含有任何不确定的东西了。信息量的定义没有包含和时间的任何关系。
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