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At P985 of the book, says But there are cuts that are not determined by rational numbers. If we put into the first class all negative rational numbers 阅读全文
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We define the smallest positive real number as the number which is explicitly greater than zero and yet less than all other positive real numbers exce 阅读全文
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From the perspective of analytical geometry, an interval is composed of infinitely many points, while after the length of an interval was defined, it 阅读全文
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Dividing an unit interval \([0,1]\) into two equal subintervals by the midpoint \(\dfrac {0+1} {2}=\dfrac {1} {2}\), denote the left subinterval by \( 阅读全文
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Given an infinite sequence (a1, a2, a3, ...), a series is informally the form of adding all those terms together: a1 + a2 + a3 + ···. To emphasize tha 阅读全文
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本讲的前提是: For the time being, all quantities occurring are assumed to be rational numbers. 假设我们所知道的数只有有理数,还不知道无理数的存在。 这里说的null-sequence 是rational null-s 阅读全文