### Ideas from 'Identity and Existence in Logic' by C. Anthony Anderson [2014], by Theme Structure

#### [found in 'Bloomsbury Companion to Philosophical Logic' (ed/tr Horsten,L/Pettigrew,R) [Bloomsbury 2014,978-1-4725-2303-0]].

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###### 4. Formal Logic / E. Nonclassical Logics / 6. Free Logic
 18767 Free logics has terms that do not designate real things, and even empty domains
###### 5. Theory of Logic / G. Quantification / 5. Second-Order Quantification
 18763 Basic variables in second-order logic are taken to range over subsets of the individuals
###### 5. Theory of Logic / G. Quantification / 7. Unorthodox Quantification
 18771 Stop calling ∃ the 'existential' quantifier, read it as 'there is...', and range over all entities
###### 7. Existence / A. Nature of Existence / 2. Types of Existence
 18769 Do mathematicians use 'existence' differently when they say some entity exists?
###### 7. Existence / D. Theories of Reality / 10. Ontological Commitment / a. Ontological commitment
 18770 We can distinguish 'ontological' from 'existential' commitment, for different kinds of being
###### 9. Objects / A. Existence of Objects / 4. Impossible objects
 18766 's is non-existent' cannot be said if 's' does not designate
 18768 We cannot pick out a thing and deny its existence, but we can say a concept doesn't correspond
###### 9. Objects / A. Existence of Objects / 5. Individuation / a. Individuation
 18765 Individuation was a problem for medievals, then Leibniz, then Frege, then Wittgenstein (somewhat)
###### 9. Objects / F. Identity among Objects / 7. Indiscernible Objects
 18764 The notion of 'property' is unclear for a logical version of the Identity of Indiscernibles