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远山学习笔记|逻辑思维训练(二)

  • 2026-04-26 17:42:25
远山学习笔记|逻辑思维训练(二)

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上一期,我们聊到了逻辑学如何帮我们将模糊的直觉转化为严谨的推导。但在实际工作中,我们面临的往往不是单一的命题,而是无数个观点、条件,甚至陷阱交织在一起的复杂局面。这时候,我们就需要掌握逻辑学里最基础的运算规则

逻辑运算,本质上是处理命题之间关系的工具。就像数学里的加减乘除一样,逻辑里的非、与、或、蕴含、等价,是我们拆解复杂问题、避开语言陷阱的核心武器。

*这里需要铺垫一个基础规则,不能再拆解的命题叫「简单命题」,逻辑学里一般用P/Q/R这样的无歧义符号代替。

01. 运算符号是~)

在逻辑学中,“非”运算的规则很简单:真值翻转。如果P为真,那么~P一定为假。

但这个简单的规则,在生活中却有着深刻的启示:证实与证伪的难度是完全不对等的。要证明一个结论是对的,你需要穷尽所有例子,证明它们都符合。推翻一个结论,你只需要找到一个反例就够了。

在司法和审计中,这被称为“一票否决”。在工作中,这也提醒我们:寻找证据链的破绽,往往比构建一个完美的理论更容易。当你面对对方看似无懈可击的长篇大论时,不妨试着用“证伪”的思维去挑刺,只要找到一个逻辑死结,就能避免后续的巨大风险。

02. 运算符号是

运算(合取)把多个命题合并成复合命题,只有所有命题都为真,整个复合命题才为真,只要有一个命题假,整体就是假。在圈定矿体时,我们依赖与运算品位达标厚度达标开采技术条件允许,才能定义为工业矿体。

很多初级地质员容易犯的错误是:看到一个样品品位很高,就兴奋地认为找到了大矿。但如果这个高品位样品是孤立的,厚度不够,或者深埋在无法开采的断裂带下,那么整个矿体命题在逻辑上依然是假的。

03. 运算符号是

运算(析取)意味只要有一个命题为真,整个复合命题就是真;只有所有命题都假,整体才是假。这在工作中对应着一个极端的策略:对冲

逻辑学里的排中律P ∨ ~P = 真),是金融对冲的基石——涨了赚股价,跌了赚期权,总有一个是对的。不过,逻辑也提醒我们:现实中不管对冲是有成本的。在做项目决策时,我们既要懂得鸡蛋不要放在一个篮子里,也要警惕过度防御带来的资源浪费。要在安全与成本之间,找到那个逻辑最优的平衡点。

04. 蕴含关系符号是PQ

 “蕴含是逻辑中最容易被误解的关系。它只有一种情况是错的,那就是“P真而Q

这里有一个反直觉的逻辑铁律:如果前提P为假,那么整个蕴含关系恒为真。比如,如果太阳从西边出来,我就给你买保时捷。因为前提不可能为真,所以这句话在逻辑上是没毛病的,哪怕结论是天方夜谭。

这在工作中就是典型的空头支票伪承诺。很多忽悠人的方案,往往结论很诱人,但前提却是模糊甚至不存在的。比如一个项目对方通常风险很小,却避而不谈通常到底指什么环境,那就值得警惕。看懂蕴含关系,就是学会先检验前提。只要前提不成立,再美好的结论对你来说也毫无意义。

05. “等价”关系(符号是P↔Q)

如果P能推出Q,Q也能推出P,这就是“等价关系”。逻辑学里最实用的思维就藏在这里:如果原来的问题很难解决,可以找一个和它等价、但更简单的问题。解决了等价问题,原问题自然就解决了。

等价也是地质思维中最精彩的部分——“找替代指标”。有时候,我们很难直接找到金矿(P),因为金矿往往埋得很深。但如果我们发现,“金矿(P)”与“特定的蚀变矿物组合(Q)”是等价伴生的。

既然直接挖金矿成本太高、难度太大,我们就可以利用等价关系,转而去寻找那些特定的蚀变矿物组合。找到了Q,就等于找到了P。这种“通过找间接标志来解决直接问题”的思路,就是等价逻辑在找矿中的神级应用。

逻辑运算,本质上是处理命题之间关系的工具。就像数学里的加减乘除一样,逻辑里的非、与、或、蕴含、等价,是我们拆解复杂问题、避开语言陷阱的核心武器。

逻辑运算,本质上是一套思维的手术刀。它帮我们切开语言的华丽外衣,看到背后的真值与关系。在远山勘探,我们不仅用它来分析地质数据,更用它来处理复杂的工作关系和决策难题。

掌握这五种运算能帮助我们在这个充满噪声的世界里,保持一份难得的清醒与笃定。

END

作者|史云天

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  1. CONNECT:[ UseTime:0.001089s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001873s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000714s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000661s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001440s ]
  6. SELECT * FROM `set` [ RunTime:0.000555s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000962s ]
  8. SELECT * FROM `article` WHERE `id` = 483895 LIMIT 1 [ RunTime:0.000843s ]
  9. UPDATE `article` SET `lasttime` = 1777209006 WHERE `id` = 483895 [ RunTime:0.013088s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000317s ]
  11. SELECT * FROM `article` WHERE `id` < 483895 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000432s ]
  12. SELECT * FROM `article` WHERE `id` > 483895 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000385s ]
  13. SELECT * FROM `article` WHERE `id` < 483895 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001468s ]
  14. SELECT * FROM `article` WHERE `id` < 483895 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000908s ]
  15. SELECT * FROM `article` WHERE `id` < 483895 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002367s ]
0.181320s