(4)不存在的章节:悖论的制造与消解
在开始的写作中,这一章本是不存在的。因为李铭博主和二傻兄的缘故,我决定写这奇怪的一章。
对一个电子工程师而言,抛开哲学和数学种种讨论,会提一个问题,我们能构造一个可以展示的悖论吗。结论是:可以。
那就是:A=~A。就是说有个二值信号A,它的取值是0或者1,这个时候我们给它赋值,当它等于1的时候,它就等于0;当它等于0的时候,它就等于1。凡熟悉数字电路的读者,很容易构造实现这个悖论或者自相矛盾的逻辑。很简单,用反相器,电路如下图:
估计有很多学过电路的朋友会发晕:那么A到底等于0呢,还是1呢?
估计有不少朋友会跳出来发表意见:
(1)义正词严派:“你违规了,这个电路不能这么接!”
(2)莎士比亚派:“Be or not to be,it is a question."
(3)悲观主义者:“电路烧了!”
(4)乐天派:“管它呢!”
但是二傻和三糊涂,呆气十足地站在图下观看,等待了春秋冬夏又复春秋冬夏,想了又想。。。
最后三糊涂实在忍不住了,去买了74LS04和74HC04两种芯片,接上电,按图接好电路。用电压表测量结果:
如果,电压高于3.6v,就是“1”,低于0.7v,就是“0”。
结果是,对于74LS04而言,其电压值在2.4V附近浮动,所以既不是0,也不是1,而是在那个“不存在”的地带浮动着。
对于74HC04,其电压值则一会儿是“1”,一会儿是“0”,完全乱跳。
如果你去选用不同电路,还会有很多不同的结果。比如有一直取“1”的,有一直取“0”的,还有在“0”和“1”之间来回周期性跳跃的。。。。
。。。。。。。
二傻实在忍不住了,超起屁股下的板凳猛拍三糊涂的头:“我们是天狼星来的耶,我们比地球人还傻耶,我们是电路吗,是电路吗?”
。。。。。。。。
为了证明二傻是天狼星来的,也为了证明三糊涂确实是天狼星来的,两个人开始背天狼星口诀:
红的绿的蓝的,红的绿的蓝的,红的绿的蓝的,红的绿的蓝的,红的绿的蓝的,红的绿的蓝的, 红的绿的蓝的。
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然后,三糊涂要二傻马上回答:“刚才一共出现了几种颜色?"
二傻气不忿,为了证明二傻是天狼星来的,也为了证明三糊涂确实是天狼星来的,两个人又开始背天狼星口诀:
大的小的,小的大的,大的小的,大的小的,小的大的,大的小的,大的小的。
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“然后,马上回答:最后是‘大的’还是‘小的’?”
三糊涂立马晕菜。
https://blog.sciencenet.cn/blog-731678-666804.html
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