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A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
The second number class is the set of ordinals whose predecessors form a countably infinite set. The set of all α having countably many predecessors—that is, the set of countable ordinals—is the union of these two number classes. Cantor proved that the cardinality of the second number class is the first uncountable cardinality. [12]
According to Mikhail B. Sevryuk, in the January 2006 issue of the Bulletin of the American Mathematical Society, "The number of papers and books included in the Mathematical Reviews (MR) database since 1940 (the first year of operation of MR) is now more than 1.9 million, and more than 75 thousand items are added to the database each year. The ...
The study had three groups of 2nd grade participants: the FITD, DITF, and control groups. [15] The FITD group was asked by one teacher to do an easy 15-question worksheet and then asked 15 minutes later by another teacher to complete a 20-question worksheet. The DITF group was initially asked to complete a 100-question worksheet.
Hence, n! + 1 is not divisible by any of the integers from 2 to n, inclusive (it gives a remainder of 1 when divided by each). Hence n! + 1 is either prime or divisible by a prime larger than n. In either case, for every positive integer n, there is at least one prime bigger than n. The conclusion is that the number of primes is infinite. [8]
In 1991, Broderbund made the first of its two great contributions to the history of CD-ROM publishing by releasing, as the inaugural title in its children's software arm, Living Books: One of the first CD-ROMs ever, it was an interactive reading primer called Just Grandma and Me. "Living Books was our bet on CD-ROM as a delivery vehicle," says ...
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