Should a mathematician recalculating the elements of the set that defines the set according to G. Kantor take into account empty elements?

Question

Discrete Math

This is the pragmatics of the foundations of mathematics.

Answer 1

What engine is the site based on?
That is, it did not give you the idea that there is no CMS there?
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Результат для домена ofeed.ru
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Answer 2

MODX.

Answer 3

Hello ModX.