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Leonhard Euler

Mathematics

The Infinity of the Primes

21st September 2020 OldTrout 0

Euclid’s Elements, Book IX, Proposition 20. Theorem : Prime numbers are more than any assigned multitude of prime numbers. That is, there are infinitely many primes. Proof : Suppose that there are primes : Let [more…]

Hobbies

From a Sum to a Product

20th January 2020 OldTrout 0

In The Basel Problem we saw that Euler answered the question by showing that the sum of the reciprocals of the square numbers is equal to . That is The partial sums slowly converge to [more…]

OldTrout, Going Postal
Hobbies

A Beautiful Equation

18th November 2019 OldTrout 0

Euler gave us this jewel which is regarded by many as the most beautiful equation in mathematics; it has both elegance and simplicity. It is comprised of five fundamental numbers and the operations of addition, [more…]

Hobbies

The Basel Problem

14th January 2019 OldTrout 0

One sometimes gets very interesting results when one turns divergent sums upside down. The Basel problem was asked by Pietro Mengoli in . He asked what is the exact summation of the reciprocals of the [more…]

Hobbies

Euler’s Totient Function

6th August 2018 OldTrout 0

Euler’s totient function counts the number of positive integers up to that are relatively prime to , where is considered to be relatively prime to all .  These numbers are called the totatives of . [more…]

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Elsewhere on GP

  • Why the Swiss Voted for More Gun Control

    1st July 2019 0
    Listen to the Audio Mises Wire version of this article. On May 19, 2019, Swiss voters approved a new set of gun control restrictions. This newly-approved gun control measure would put Switzerland’s gun control laws in line with European Union standards. [more...]
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    After reading DJM’s fascinating article on words and phrases in the English language that originate from the Bard of Avon it set me wondering on the phrases and sayings we use that have their origin [more...]
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    Postcard from Piercebridge

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    5th January 2026 0
    Written by Andrew Redfern, and launched as a Kickstarter project in July 2025, Minifigure Monarchs was successfully funded within 24 hours. At 336 pages this hardback was a definite addition to my Christmas list!  It’s [more...]

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