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  2. Year 1900 problem - Wikipedia

    en.wikipedia.org/wiki/Year_1900_problem

    Microsoft Excel (using the default 1900 Date System) cannot display dates before the year 1900, although this is not due to a two-digit integer being used to represent the year: Excel uses a floating-point number to store dates and times. The number 1.0 represents the first second of January 1, 1900, in the 1900 Date System (or January 2, 1904 ...

  3. Ramanujan's sum - Wikipedia

    en.wikipedia.org/wiki/Ramanujan's_sum

    In number theory, Ramanujan's sum, usually denoted c q (n), is a function of two positive integer variables q and n defined by the formula c q ( n ) = ∑ 1 ≤ a ≤ q ( a , q ) = 1 e 2 π i a q n , {\displaystyle c_{q}(n)=\sum _{1\leq a\leq q \atop (a,q)=1}e^{2\pi i{\tfrac {a}{q}}n},}

  4. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    In the second line, the number one is added to the fraction, and again Excel displays only 15 figures. In the third line, one is subtracted from the sum using Excel. Because the sum in the second line has only eleven 1's after the decimal, the difference when 1 is subtracted from this displayed value is three 0's followed by a string of eleven 1's.

  5. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    He developed formulas for calculating the surface area and volume of solids of revolution and used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, in a manner not too dissimilar from modern calculus. [81]

  6. Vieta's formulas - Wikipedia

    en.wikipedia.org/wiki/Vieta's_formulas

    Vieta's formulas are then useful because they provide relations between the roots without having to compute them. For polynomials over a commutative ring that is not an integral domain, Vieta's formulas are only valid when a n {\displaystyle a_{n}} is not a zero-divisor and P ( x ) {\displaystyle P(x)} factors as a n ( x − r 1 ) ( x − r 2 ) …

  7. Social Security (United States) - Wikipedia

    en.wikipedia.org/wiki/Social_Security_(United...

    Notes: Tax rate is the sum of the OASDI and Medicare rate for employers and workers. In 2011 and 2012, the OASDI tax rate on workers was set temporarily to 4.2% while the employers OASDI rate remained at 6.2% giving 10.4% total rate. Medicare taxes of 2.9% now (2013) have no taxable income ceiling. Sources: Social Security Administration [12] [13]

  8. Isaac Newton - Wikipedia

    en.wikipedia.org/wiki/Isaac_Newton

    Newton "recognized Christ as a divine mediator between God and man, who was subordinate to the Father who created him." [161] He was especially interested in prophecy, but for him, "the great apostasy was trinitarianism." [162] Newton tried unsuccessfully to obtain one of the two fellowships that exempted the holder from the ordination requirement.

  9. Counting of the Omer - Wikipedia

    en.wikipedia.org/wiki/Counting_of_the_Omer

    The count has its origins in the biblical command of the Omer offering (or sheaf-offering), which was offered on Passover, and after which 49 days were counted, and the Shavuot holiday was observed. The Temple sacrifices have not been offered since the destruction of the Temple in Jerusalem, but the counting until Shavuot is still performed ...