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เราอาจจะคิดว่าเซต คือ กลุ่มของสิ่งต่างๆซึ่งมีกฎเกณฑ์ชัดเจนว่าสิ่งใดอยู่ในเซตและสิ่งใดไม่ได้อยู่ในเซต สิ่งที่อยู่ในเซตเรียกว่าสมาชิกของเซต โดยทั่วไปจะแทนเซตด้วยตัวอักษรภาษาอังกฤษตัวพิมพ์ใหญ่ เช่น A,B,C และแทนสมาชิกของเซตซึ่งยังไม่เจาะจงว่าคือตัวอะไรด้วยอักษรภาษาอังกฤษตัวพิมพ์เล็ก เช่น a,b,c
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