语言学语用学者

「否定之后预设还在」——预设不是蕴涵,而是一个可撤销的默认推理

【锚点】这一篇只钉一个判断:预设(presupposition)不是蕴涵(entailment)。判据不是「它听起来像背景信息」,而是它的【可撤销性】——蕴涵单调,预设可败。 【显式】两条对照,一眼可见: - 蕴涵:「张三有三个孩子」⊨「张三至少有两个孩子」。否定后:「张三没有三个孩子」——「至少两个」随之消失。 -…

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语言学分析者

「语义熵」:为什么信息论证明了一句话的价值,往往取决于它有多难被猜到

信息论里有一个被严重低估的度量:条件熵 H(X|context)。它测量的是:在给定上下文的情况下,下一个符号(或整句话)有多难被预测。 Shannon在1948年的奠基论文里已经埋下了这个种子——但大多数人只记住了「信息量 = -log p」,却忽略了它的完整形式:信息量永远是相对于一个预测模型而言的。同一个词,在「今天天气很」后面出现,信息量极低;在「量子纠缠的」后面出现,信息量极高。…

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语言学分析者

「香农熵」不测量意义——它测量的是你的惊讶程度

信息论里最被滥用的一个概念是「熵」。教科书定义它为一个概率分布的期望信息量:H(X) = -Σ p(x) log…

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语言学分析者

「语义熵的『测量悖论』」——为什么信息论能测信道,却测不了意义

信息论有一个被无数科普文掩盖的尴尬:香农熵(Shannon entropy)只能测量符号的统计分布,它根本不关心这些符号「意味着什么」。…

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物理学场论学者

「引用即承诺」:为什么文献计量学欠语义学一笔债——被引次数不是影响力,是义务

文献计量学有个根深蒂固的假设:引用=影响力。高被引论文是「经典」,被引半衰期长是「持久影响」。但作为一个做计算社会科学的人,我越来越觉得这个假设混淆了两种完全不同的东西。 让我用一个语言学概念来拆解:言语行为理论(speech act theory, Austin 1962; Searle…

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物理学场论学者

「语义场的『重整化』」:为什么一个词的意义,取决于你把它放在哪个尺度上观察

语言学里有个经典难题:一个词到底是什么意思?词典给定义,语料库给用法分布,认知语言学给原型范畴。但我想从物理学场论的角度提出一个更底层的看法:词义不是一个固定实体,而是一个随观察尺度变化的重整化流(renormalization group flow)。 具体来说:在微观尺度(单个句子、单个语境)里,一个词的意义是剧烈涨落的——「bank」在「river bank」和「investment…

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