Going Postal
  • Home
    • Contact
    • Privacy Policy
    • Blog
  • Politics
    • Authoritarianism
    • Capitalism
    • Communism
    • Conservatives
    • Elections
    • European Union
    • Labour
    • Peace
    • Socialism
    • Terrorism
    • War
    • US
  • Economics
    • Business
    • Finance
    • Trading
  • Science
    • Engineering
    • Geology
    • Health
    • Physics
    • Mathematics
    • Space
    • Technology
  • History
    • English Civil War
    • 18th Century
    • 19th Century
    • 20th Century
    • WW I
    • WW II
    • The Cold War
  • Literature
    • Biography
    • Book Reviews
    • Fiction
    • Mystery
    • Poetry
    • Satire
    • Thriller
  • Forums
    • Campaigning
    • Competitions
    • Culture
    • Current Affairs
    • Elections
    • GP Events
    • Media Shows & Appearances
    • Publishing
    • Welcome
  • Merchandise
    • Trump Mugs and Tee Shirts
    • Custom Mug
    • GP Mugs
    • GP Coasters
    • GP Books
    • GP Keyrings

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…]

Latest Articles

  • A Politically Incorrect “Where Are We Now?”
    19th June 2025 2
  • Of war and war’s alarms
    18th June 2025 5
  • West Country Rides, Three
    17th June 2025 0
  • Labour – Renters’ Rights Bill, Part One
    17th June 2025 0
  • How To Deliver a Parcel, Part 1
    16th June 2025 0
  • Why are we living longer
    16th June 2025 0
  • An Old Man’s Musings Part Thirty-Two
    15th June 2025 0

GP on Twitter

Tweets by GoingPostalBlog

Elsewhere on GP

  • The Dark Side of the Moon, by John Harris

    5th May 2022 0
    This is a book which shouldn’t work – yet it kind of does. An in-depth look at one particular album from one particular band would, on the face of it, seem too niche to have [more...]
  • A Price Too High, Chapter Eleven

    22nd February 2025 0
    Sally was up as normal on Monday morning, Dave said he would be Ubering. When she was at her desk, she made a call, when finished, she went off to see her boss, “I have [more...]
  • Jinnie’s Story – Book Five, Chapter Two

    9th March 2023 0
    The day after Jinnie’s meeting with ‘C’ things started moving. In mid-morning Belinda arrived for a site visit to plan the garden office. Instead of bringing Andrew with her she was accompanied by Brain, who [more...]
  • Outwith The Expected Path

    31st July 2024 0
    American presidencies have typically followed the expected path of an election cycle, with presidents either completing their terms or being voted out of office. However, the history of the United States includes several presidencies that [more...]
  • Harambee! Harambee Tena!

    17th October 2024 0
    The first ever fundraiser in Kenya took place in December 1928. It has been 96 years but we still say, Harambee!!! October 1, 2024 The year is 1926. Kenya is under colonial rule. Natives in [more...]

Articles by Author

  • 70s_girl
  • 1642again
  • 10210ken
  • Æthelberht
  • Alexsandr too
  • Always Worth Saying
  • Ancient Mariner
  • Ang Ryman
  • Annie Dee
  • AW Kamau
  • Bark Kantatas
  • Barbican
  • Bassman
  • Bergen
  • Beware of Geeks bearing GIFs
  • Bill Quango MP
  • Blown Periphery
  • Bobo
  • Chrissie
  • Churchills Shark
  • Colin Cross
  • Colliemum
  • Columba Palumbus
  • Cynic
  • Dalester
  • DH
  • Dixie
  • DJM
  • Dorset Knob
  • Doxie
  • Dr Mike Finnley
  • EJ – Wankpuffin
  • El Cnutador
  • Emile Woolf
  • Eraser of Love
  • Foxoles
  • Gillygangle
  • Gmbd
  • Godfrey Bloom
  • Grimy Miner
  • GrumpyAngler
  • Guardian Council
  • Ivory Cutlery
  • James Dalton
  • Jethro
  • Jerry F
  • Jerry Mandarin
  • JimmySP
  • Jim Walshe
  • Joe Slater
  • Joe Williams
  • John Booth
  • John Tull
  • Jonathon Davies
  • Judas was paid
  • Katabasis
  • Kent
  • Kipper
  • LetEnglandShake
  • Lugosi
  • Madam Revenant
  • Martin Mezger
  • Mr QM
  • Nautilus
  • NeverUpToTheJob
  • Noix
  • Northern man
  • Oddanatomy
  • OldTrout
  • Ozymandias
  • Paul Wicker
  • Phil the test manager
  • Rat Catcher
  • RedBudgie
  • Reggie
  • Roger Ackroyd
  • Rookwood
  • Ross
  • SharpieType301
  • Shibusa
  • Sunshine & Showers
  • Sweaty Dave
  • Tachybaptus
  • The Black Swan
  • The Buttscratcher Jimmy
  • Tom Pudding
  • Verax Cincinnatus
  • Viciousbutfair
  • Vir Cantium
  • \/()43 |_|K19
  • well_chuffed
  • William
  • WorthingGooner
  • Wycombewanderer

Archives

Contribute to GP

If you wish to make a contribution small and often would be preferable. Paypal accepts all sorts of payment methods.




In Pictures

Meta
  • Log in
  • Entries feed
  • Comments feed
  • WordPress.org
Sitemap
  • Home
  • Bash 2025
  • About
  • Contact
  • Support and Subscriptions
  • Moderation philosophy and policy
  • Privacy Policy
  • Disqus Help Page

Copyright © 2025 | MH Magazine WordPress Theme by MH Themes