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十、常见逻辑谬误(二)

Informal Fallacies: Inductvie arguments are technically invalid, (即使前提正确也可能推出错误结论),因此”归纳推理“中论点和论据关系常被分为strong和weak。

 

Fallacies of Ambiguity

1.fallacy of equivocation

e.p. The sign said "fine for parking here".

I'm fine.

Therefore, I park here.

 

2.straw man fallacy

person A has position X

person B presents position Y (which is a distorted version of X)

person B attacks position Y

Therefore X is false/incorrect/flawed.

 

e.p. Bill: We should clean out the closets. They are getting a bit messy.

Joe: Why? We just went through those closets last month. Do we have to clean them out everyday?

Bill: I never said anything about doing that every day! You just want to keep all your junk forever, which is ridiculous! (Bill说应该搞卫生了(X),Joe反驳说难道我们应该天天搞卫生吗(Y)将X概念换成了Y概念,攻击Y概念)

 

Fallacies of Presumption

1.false dilemma

故意创造出either...or...两分情景,实际上还有第三种选择。

 

2.slippery slope

“一个马蹄铁导致国家灭亡的故事”

A导致B,B导致C,C导致......所以A最终会导致Z。其中的关联性都只是“probably”而没有紧密必然性。

 

3.begging the question 循环论证(结论已经包含在前提中)

e.p. God exist.

How do you know?

Coz the Bible says so.

Why should I trust the Bible?
Because it's the words of God!

 

4.Post hoc(fallacy of false cause)

发生在后的事件一定“某”个发生在前的事件导致的(也许是某一些或...)

 

5. Texas Sharpshooter

“你看到的是你最想看到的事实”

刻意拿出部分数据来证明两件事之间的相关性,其实在全部样本之下两件事之间关系并不紧密。

 

Fallacies of Relevance

e.p. appeal to antiquity(传统这么做是对的,所以现在做依然是对的)/novelty/authority(用一个领域专家的话去论证另一个领域是对的)/popularity/...

Bandwagon (一件事情被越来越多的人认为是对的)

 

书籍推荐

《Proofiness by Charles Seife》

《The Black Swan by Nassim Nicholas Taleb》

《Love is Fallacy》(a passage picked from a textbook)

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Informal fallacies

1. Fallacies of ambiguity

2. Fallacies of presumption

    False dilemma

    Slippery slope

    Begging the question

    Post hoc

    Texas sharpshooter

3. Fallacies of relevance

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Fallacy of Division 因为一个集合的整体有某种特征,因此判定它的个体也具有某种特征

中国人比较保守,你是中国人,所以你也比较保守

Fallacy of Composition 以为一个个体具有/不具有某种特征,因此推断他组成的集合也具有/不具有某种特征

Irrelevant Appeals 用你本身argue的东西无关的信息来支撑观点

Weak Anology 两者具有相似性,一个怎样,所以认为另一个同样

Genetic Fallacy 论证的source就是错误的

Band Wagon 一件事越来越popular,所以是对的

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