duck typing – A style of dynamic typing in object-oriented programming

extensionality – Logic principle

I know it when I see it – Colloquial expression

identity of indiscernibles – Impossibility for separate objects to have all their properties in common

inductive reasoning – Method of logical reasoning

philosophical razor – Principle that allows one to eliminate unlikely explanations

sympathetic magic – Type of magic based on imitation or correspondence

The purpose of a system is what it does – Systems thinking heuristic

Zebra (medicine) – Unnecessarily exotic diagnosis in medicine

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