### 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
 7785 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
 10699 Does a bowl of Cheerios contain all its sets and subsets?
###### 5. Theory of Logic / A. Overview of Logic / 7. Second-Order Logic
 10225 Monadic second-order logic might be understood in terms of plural quantifiers
 10736 Boolos showed how plural quantifiers can interpret monadic second-order logic
 10780 Any sentence of monadic second-order logic can be translated into plural first-order logic
###### 5. Theory of Logic / D. Assumptions for Logic / 4. Identity in Logic
 10697 Identity is clearly a logical concept, and greatly enhances predicate calculus
###### 5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
 13671 Second-order quantifiers are just like plural quantifiers in ordinary language, with no extra ontology
###### 5. Theory of Logic / G. Quantification / 6. Plural Quantification
 10267 We should understand second-order existential quantifiers as plural quantifiers
 10698 Plural forms have no more ontological commitment than to first-order objects
###### 5. Theory of Logic / G. Quantification / 7. Unorthodox Quantification
 7806 Boolos invented plural quantification
###### 7. Existence / D. Theories of Reality / 10. Ontological Commitment / b. Commitment of quantifiers
 10700 First- and second-order quantifiers are two ways of referring to the same things