(相关资料图)
1、 确界原理（ supremum and infimum principle ）是刻画实数完备性的命题之一。
2、 设S为非空数集。若S有上界，则S必有上确界；若S有下界，则S必有下确界。
(相关资料图)
1、 确界原理（ supremum and infimum principle ）是刻画实数完备性的命题之一。
2、 设S为非空数集。若S有上界，则S必有上确界；若S有下界，则S必有下确界。
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