http://ostap.livejournal.com/ ([identity profile] ostap.livejournal.com) wrote in [personal profile] aptsvet 2007-08-05 04:04 pm (UTC)

Вовсе не обязательно. Множество натуральных чисел бесконечно, но ни одно число в нём не повторяется.
(72 comments)

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