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Library / First Principles Framework (FPF) - Core Conceptual Specification
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B.5.TC:2 - Problem

Two descriptions can use the same word for different quantities, or different words for a shared construction. One can answer a weaker question. They can agree on observations while disagreeing about an intervention. An approximate computation can also obscure agreement between the theories from which the computations were derived.

A useful comparison must recover enough of each application to distinguish these situations. It must also leave room for an account that opens a question the original comparison did not ask. The practical problem is to determine what the difference permits, prevents or changes for the work, without requiring a verdict on the theories in every possible use.