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哥德尔定理和西蒙的哲学（4）
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（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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