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2. Kaktovik numerals - Wikipedia

   en.wikipedia.org/wiki/Kaktovik_numerals

   30,561 10 3,G81 20 ÷ ÷ ÷ 61 10 31 20 = = = 501 10 151 20 30,561 10 ÷ 61 10 = 501 10 3,G81 20 ÷ 31 20 = 151 20 ÷ = (black) The divisor goes into the first two digits of the dividend one time, for a one in the quotient. (red) fits into the next two digits once (if rotated), so the next digit in the quotient is a rotated one (that is, a five). (blue) The last two digits are matched once for ...

3. 20 (number) - Wikipedia

   en.wikipedia.org/wiki/20_(number)

   To represent this, the Japanese language has a special word for "20-years-old" that does not follow the rest of their numbering system. Accordingly, the word 二十歳 is read all at once as "はたち" ( hatachi ) rather than the expected pronunciation of the three characters as "にじゅうさい" ( nijyuusai , which is literally "two," "ten ...

4. Large-print - Wikipedia

   en.wikipedia.org/wiki/Large-print

   In 1969, Thorpe's company, Ulverscroft, began producing the books in 16 point type and normal-sized bindings, which the company claims increased the acceptance of large print in public libraries. 16 point type is smaller than the minimum recommended by the American Council of the Blind, [11] which recommends 20 point, with 18 point as a ...

5. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem , there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes .

6. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   Some Greek mathematicians treated the number 1 differently than larger numbers, sometimes even not as a number at all. [c] Euclid, for example, defined a unit first and then a number as a multitude of units, thus by his definition, a unit is not a number and there are no unique numbers (e.g., any two units from indefinitely many units is a 2). [17]

7. Trace field of a representation - Wikipedia

   en.wikipedia.org/wiki/Trace_field_of_a...

   Fuchsian groups are discrete subgroups of ().The trace of an element in () is well-defined up to sign (by taking the trace of an arbitrary preimage in ()) and the trace field of is the field generated over by the traces of all elements of (see for example in Maclachlan & Reid (2003)).