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  2. Straightedge and compass construction - Wikipedia

    en.wikipedia.org/wiki/Straightedge_and_compass...

    A regular n-gon has a solid construction if and only if n=2 a 3 b m where a and b are some non-negative integers and m is a product of zero or more distinct Pierpont primes (primes of the form 2 r 3 s +1). Therefore, regular n-gon admits a solid, but not planar, construction if and only if n is in the sequence

  3. Champernowne constant - Wikipedia

    en.wikipedia.org/wiki/Champernowne_constant

    The definition of the Champernowne constant immediately gives rise to an infinite series representation involving a double sum, = = = (+), where () = = is the number of digits between the decimal point and the first contribution from an n-digit base-10 number; these expressions generalize to an arbitrary base b by replacing 10 and 9 with b and b − 1 respectively.

  4. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The decimal expansion of the golden ratio ⁠ ⁠ [1] has been calculated to an accuracy of ten trillion (⁠ = ⁠) digits. [ 66 ] In the complex plane , the fifth roots of unity ⁠ z = e 2 π k i / 5 {\displaystyle \textstyle z=e^{2\pi ki/5}} ⁠ (for an integer ⁠ k {\displaystyle k} ⁠ ) satisfying ⁠ z 5 = 1 {\displaystyle \textstyle z ...

  5. Real number - Wikipedia

    en.wikipedia.org/wiki/Real_number

    Another decimal representation can be obtained by replacing with < in the preceding construction. These two representations are identical, unless x is a decimal fraction of the form m 10 h . {\textstyle {\frac {m}{10^{h}}}.}

  6. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    To change ⁠ 1 / 3 ⁠ to a decimal, divide 1.000... by 3 (" 3 into 1.000... "), and stop when the desired accuracy is obtained, e.g., at 4 decimals with 0.3333. The fraction ⁠ 1 / 4 ⁠ can be written exactly with two decimal digits, while the fraction ⁠ 1 / 3 ⁠ cannot be written exactly as a

  7. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Last, multiply the original expression of the physical value by the fraction, called a conversion factor, to obtain the same physical value expressed in terms of a different unit. Note: since valid conversion factors are dimensionless and have a numerical value of one , multiplying any physical quantity by such a conversion factor (which is 1 ...

  8. Michelle Obama Skips Jimmy Carter's Funeral and Is 'Still in ...

    www.aol.com/michelle-obama-skips-jimmy-carters...

    The former first lady was notably absent from President Jimmy Carter's state funeral service, leading Barack Obama and Donald Trump to be seated next to one another

  9. Construction of the real numbers - Wikipedia

    en.wikipedia.org/wiki/Construction_of_the_real...

    An axiomatic definition of the real numbers consists of defining them as the elements of a complete ordered field. [2] [3] [4] This means the following: The real numbers form a set, commonly denoted , containing two distinguished elements denoted 0 and 1, and on which are defined two binary operations and one binary relation; the operations are called addition and multiplication of real ...