“Besicovitch's work
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送交者: 田野 于 2009-01-15, 11:25:02:
回答: What makes you think of "如果为0"? 由 LaoXiao 于 2009-01-15, 08:45:51:
“Besicovitch's work showing such a set could have arbitrarily small (and even zero) measure was from 1919.”
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