Ideas from 'Mathematical Logic (revised)' by Willard Quine [1940], by Theme Structure
[found in 'Mathematical Logic (revised)' by Quine,Willard [Harvard 1979,0674554515]].
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5. Theory of Logic / E. Structures of Logic / 4. Variables in Logic
12221

'Corner quotes' (quasiquotation) designate 'whatever these terms designate'
