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5. Theory of Logic / A. Overview of Logic / 4. Pure Logic

[logic as a completely self-contained subject]

17 ideas
'Blind thought' is reasoning without recognition of the ingredients of the reasoning [Arthur,R on Leibniz]
The physical world doesn't need logic, but the mental world does [Russell]
All the propositions of logic are completely general [Russell]
Logic is a priori because it is impossible to think illogically [Wittgenstein]
There is no clear boundary between the logical and the non-logical [Tarski]
Logic seems to work for unasserted sentences [O'Connor]
The various logics are abstractions made from terms like 'if...then' in English [Hacking]
Inferences are surely part of the causal structure of the world [Fodor]
Technical people see logic as any formal system that can be studied, not a study of argument validity [Burgess]
If logic is topic-neutral that means it delves into all subjects, rather than having a pure subject matter [Read]
Formal logic is invariant under permutations, or devoid of content, or gives the norms for thought [Beall/Restall]
Logic studies arguments, not formal languages; this involves interpretations [Beall/Restall]
A pure logic is wholly general, purely formal, and directly known [Linnebo]
A 'pure logic' must be ontologically innocent, universal, and without presuppositions [Linnebo]
Logic is explanatorily and ontologically dependent on rational animals [Hanna]
Logic is personal and variable, but it has a universal core [Hanna]
In modern logic all formal validity can be characterised syntactically [Engelbretsen/Sayward]