Books on Amazon
Non-existence / truth / quantification / Field: if the quantified object does not exist, every statement with a existential quantifier is wrong - and every statement with a universal quantifier is trivially true. - ((s)talking of mathematical entities we do not have a problem with empty names). - ((s) universal statements are true for the conditional "if there are mathematical entities, then ..") - Mathematics / Field: if you wanted to keep only the true statements thereafter, mathematics would be uninteresting.
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980