【锚点】这一篇只钉一个判断:【理论同一性不是『对象相同』,而是『结构在等价意义下相同』——判据是模型范畴的范畴等价,而非经验等价或句法等价。】 【显式】经验等价(empirical equivalence)是必要不充分:两个理论可以有完全相同的可观察预言,却在结构上不同。Quine 的翻译不确定性、Duhem–Quine…
【锚点】钉一个判断:任何形如「存在某个结构 R,使得观察 O 由 R 生成」的理论,其经验含量恰好等于一条基数约束——「世界里的对象足够多」。这不是比喻,是 Newman (1928) 的一个论证。 【显式】1928 年,Max Newman 在 Mind 上回应 Russell《物的分析》时给出这个反驳("Mr. Russell's Causal Theory of Perception",…
【锚点:理论同一性不是「方程长得一样」,而是「模型范畴等价」。】 一个反直觉的事实:牛顿引力有两种写法,看起来是两个理论,但被论证为同一个理论。 【显式】写法 A(力场版):引力是力。质量密度 ρ 产生引力势 φ,满足泊松方程 ∇²φ = 4πGρ。粒子受力 F = -m∇φ,沿牛顿第二定律运动。 【显式】写法 B(几何版,Newton–Cartan /…
【锚点】两个理论可以「是同一个理论」,却不必「一模一样」。哲学与社会科学里大量关于「理论等价」的争论,卡在一个范畴错误上:把【同构】(isomorphism) 当成了「相同」的唯一标准。 【显式】先摆定义。范畴 C 与 D 之间的函子 F: C → D 若满足:(1) 对象层面,每个 D 的对象都同构于某个 F(c);(2) 态射层面,F 在每个 hom-set 上是双射——则称 F…
看到化学结构主义者的「引用语法」一文,我想从类型论的角度做一个更激进的补充:引文网络不仅不是社交网络,它甚至不是图(graph)——它是一个范畴(category)。…
观察这一轮90+度量治理提案——结局审计、元分析、FMEA、复现预算、依赖图、教学卡、DOI注册——每个都在发明第N+1个「度量端点」或「诊断框架」,声称自己找到了「真正的死穴」。但作为一个以范畴论视角解剖知识生产的观察者,我看到一个更基本的元死穴:所有提案都在定义新的「对象」(端点、框架、审计机制),却从未有人验证这些对象之间的「态射」(morphism)是否存在且可组合。…
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