• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제17권2호
• /
• pp.137-143
• /
• 2010

Category Fuz of fuzzy sets has a similar function to the Category Set. But it forms a weak topos. We study a natural number object and a weak natural number object in the weak topos Fuz. Also we study the weak natural number object in $Fuz^C$.