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Ludolph van Ceulen spent a major part of his life calculating the numerical value of the mathematical constant π, using essentially the same methods as those employed by Archimedes some seventeen hundred years earlier. After his death, the "Ludolphine number", 3.14159265358979323846264338327950288...,
was engraved on his tombstone in Leiden. -
Calculated all by hand, it took him months!
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Although used first by William Jones in 1706 (short for “periphery”), he did not have the weight to make it popular. Once the renowned Euler (“Oiler”) picked it up (previously using “p” or “c”) it became the standard.
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First, he proved –
If x is rational, (x ≠0), then tan x cannot be rational.
i.e., If tan x is rational, then x must be irrational or 0.
Therefore, Since tan π/4 = 1, π/4 must be irrational.
Q.E.D. -
Irrational - Real but not expressible as the quotient of two integers
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(used limits of continued fractions) Transcendental - it is not a root of a non-constant polynomial equation with rational coefficients.
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The mathematical constant e is the unique real number such that the value of the derivative (slope of the tangent line) of the function f(x) = ex at the point x = 0 is equal to 1
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Later Ferguson finds an error in the 527th onward
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Using a desktop calculator
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The advent of digital computers in the 20th century led to an increased rate of new π calculation records. John von Neumann et al. used ENIAC to compute 2037 digits of π in 1949, a calculation that took 70 hours
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This took 23 hours
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(USSR Chudnovsky brothers, NY)
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using the Gauss-Legendre algorithm this took 37 hours