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1:引自OG:If an integer is divisible by 2, it is called an even integer; otherwise it is an odd
integer. Note that when a positive odd integer is divided by 2, the remainder is al-
ways 1. The set of even integers is and the set of odd ..., −6, −4, −2, 0, 2, 4, 6, ... ,
integers is There are several useful facts regarding the ..., −5, −3, −1, 1, 3, 5, ... .
2:自然数,在OG上没提到,考试应该也不会说什么自然数,要么说非负整数。根据高考的经验,0是自然数 |
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