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自然數即非負整數. 非負整數,包括正整數和零.自然數也通常是指非負整數.自然數即用以計量事物的件數或表示事物次序的數,是用数字0,1,2,3,4,……所表示的數.我們常用的計數單位有:個、十、百、千、萬、十萬等等. 所以,自然數由0開始(有爭議),一個接一個,組成了自然數集.這是一個可數的,無上界的無窮集合.數學家一般以N來表示它.
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