Christopher F. Freiling is a set theorist responsible for Freiling's axiom of symmetry. Freiling's axiom of symmetry ( AX) is a set-theoretic axiom proposed by Chris Freiling. He is currently a member of the faculty of the Department of Mathematics at California State University, San Bernardino. California State University San Bernardino is a state-funded university in San Bernardino California, part of the California State University System He was born January 4, 1954 in San Francisco CA.