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Feb. 20th, 2019 11:56 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
timeletsTwo logics are “the same” if and only if they are equivalent as preorders.
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Observe that both logics can use the same set A of statements, but the consequence relation is different for the two.
--- Lutz Straßburger. What is a logic, and what is a proof?, 2006
The concept of "consequences relation" is key to understanding misunderstandings.
