question: What excluded a set from belonging to itself in set theory ?
answer: if one set belongs to another then the first must necessarily come before the second in the succession
turker_answer: In theory , if one set belongs to another , then the first must necessarily come before the second in the succession , thus excluding a set from belonging to itself .
rule-based: If one set belongs to another then the first must necessarily come before the second in the succession excluded a set from belonging to itself in set theory .