Ideas from 'To be is to be the value of a variable..' by George Boolos [1984], by Theme Structure

[found in 'Logic, Logic and Logic' by Boolos,George [Harvard 1999,0-674-53767-x]].

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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / a. Sets as existing
The use of plurals doesn't commit us to sets; there do not exist individuals and collections
4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory
Does a bowl of Cheerios contain all its sets and subsets?
5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
Any sentence of monadic second-order logic can be translated into plural first-order logic [Linnebo]
Monadic second-order logic might be understood in terms of plural quantifiers [Shapiro]
Boolos showed how plural quantifiers can interpret monadic second-order logic [Linnebo]
5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
Identity is clearly a logical concept, and greatly enhances predicate calculus
5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
Second-order quantifiers are just like plural quantifiers in ordinary language, with no extra ontology [Shapiro]
5. Theory of Logic / G. Quantification / 6. Plural Quantification
We should understand second-order existential quantifiers as plural quantifiers [Shapiro]
Plural forms have no more ontological commitment than to first-order objects
5. Theory of Logic / G. Quantification / 7. Unorthodox Quantification
Boolos invented plural quantification [Benardete,JA]
7. Existence / D. Theories of Reality / 10. Ontological Commitment / b. Commitment of quantifiers
First- and second-order quantifiers are two ways of referring to the same things