question: What 2 techniques did Von Neumann use to exclude sets in his doctoral thesis in 1925 ?
answer: the axiom of foundation and the notion of class .
turker_answer: Von Neumann used to exclude the axiom of foundation and the notion of class sets in his doctoral thesis in 1925 .
rule-based: Von Neumann used to exclude the axiom of foundation and the notion of class sets in his doctoral thesis in 1925 .