A modern philosopher of this discipline, Penelope Maddy, drew on UCLA's mysterious “Cabal” Seminar. Theories of this discipline address the “plurality of interpretations,” like one named after Paul Bernays concerned with “classes.” An essay by Paul Benacerraf that claims no objects with only structural properties exist addresses what objects in this field “could not (15[1])be.” A theory of this discipline which considers it to be entirely a fabrication of the mind rejects the (*) Law of the Excluded Middle and was developed by L.E.J. (10[1])Brouwer. Statements in this discipline are not invented but discovered according to (10[1])its “Platonists.” For 10 points, Kurt Gödel’s (10[1])incompleteness theorems caused major reckonings in the philosophy of what discipline, which has subfields like set theory? ■END■