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2. Trace (linear algebra) - Wikipedia

   en.wikipedia.org/wiki/Trace_(linear_algebra)

   The trace of a Hermitian matrix is real, because the elements on the diagonal are real. The trace of a permutation matrix is the number of fixed points of the corresponding permutation, because the diagonal term a ii is 1 if the i th point is fixed and 0 otherwise. The trace of a projection matrix is the dimension of the target space.

3. 0 - Wikipedia

   en.wikipedia.org/wiki/0

   A number line from −3 to 3, with 0 in the middle. The number 0 is the smallest nonnegative integer, and the largest nonpositive integer. The natural number following 0 is 1 and no natural number precedes 0. The number 0 may or may not be considered a natural number, [70] [71] but it is an integer, and hence a rational number and a real number ...

4. Symbols for zero - Wikipedia

   en.wikipedia.org/wiki/Symbols_for_zero

   A comparison of the letter O and the number 0 Traditionally, many print typefaces made the capital letter O more rounded than the narrower, elliptical digit 0. [ 1 ] Typewriters originally made no distinction in shape between O and 0; some models did not even have a separate key for the digit 0.

5. Regional handwriting variation - Wikipedia

   en.wikipedia.org/wiki/Regional_handwriting_variation

   In "old style" text figures, numerals 0, 1 and 2 are x-height; numerals 6 and 8 have bowls within x-height, plus ascenders; numerals 3, 5, 7 and 9 have descenders from x-height, with 3 resembling ʒ; and the numeral 4 extends a short distance both up and down from x-height. Old-style numerals are often used by British presses.

6. Numeral system - Wikipedia

   en.wikipedia.org/wiki/Numeral_system

   In general, if b is the base, one writes a number in the numeral system of base b by expressing it in the form a n b n + a n − 1 b n − 1 + a n − 2 b n − 2 + ... + a 0 b 0 and writing the enumerated digits a n a n − 1 a n − 2... a 0 in descending order. The digits are natural numbers between 0 and b − 1, inclusive.

7. Maya numerals - Wikipedia

   en.wikipedia.org/wiki/Maya_numerals

   Numbers after 19 were written vertically in powers of twenty. The Mayan used powers of twenty, just as the Hindu–Arabic numeral system uses powers of ten. [2] For example, thirty-three would be written as one dot, above three dots atop two bars. The first dot represents "one twenty" or "1×20", which is added to three dots and two bars, or ...