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

  • Amended & updated notes from 1983 – an RMA (War Games) lecture
    30th March 2026 0
  • Strategy, some Observations
    30th March 2026 0
  • An Old Man’s Musings Part The Last
    29th March 2026 0
  • Larry’s Diary, Week Three Hundred And Twenty
    29th March 2026 0
  • Palm Sunday crosses
    ‘Agua ai cordi’
    29th March 2026 0
  • Defender of the Faith?
    28th March 2026 0
  • On Dangerous Ground, Chapter Twelve
    28th March 2026 0

GP on Twitter

Tweets by GoingPostalBlog

Elsewhere on GP

  • Cnuteneering

    6th October 2020 0
    Cnuteneering[ ca-noot-en-neer-ing ] noun The art or science of making practical application of the lack of knowledge of pure sciences, such as physics or chemistry, as in the construction of engines or cars without suffering [more...]
  • Plain Sailing towards a Future Navy?

    14th March 2026 0
    Although the present crisis in the Gulf has provoked both mockery and concern at the thinness of the Navy, a lump came to the throat all the same when seeing HMS Dragon finally leave Portsmouth [more...]
  • G4E3 – Northern Soul & Disco – Middle Era

    14th July 2023 0
    Welcome pop pickers. This is based on stuff like what I like, there will be various bands and artists to try and cheer you up and kick-start your weekend.  Hopefully for many of you, to [more...]
  • Postcard from Lille, prologue

    4th January 2019 0
    Previously, underused first class carriages formed an overnight , £5 a seat, train between Glasgow and London. It was called the Nightrider. In those days Scotsman would travel with ghettoblasters and a cardboard tray of [more...]
  • Blown Periphery, Going Postal

    Hope in the Darkest Night

    30th December 2020 0
    Detective Inspector Charles Hope detested mortuaries. Some pathologists were matter-of-fact in their dealings with the dead and part of him understood. They had a job to do and most of them carried out their gruesome [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_Southampton
  • Paul Wicker
  • Pete Plug
  • 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
  • Upset
  • 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

  • Palm Sunday crosses
Meta
  • Log in
  • Entries feed
  • Comments feed
  • WordPress.org
Sitemap
  • Home
  • Bash 2026
  • About
  • Contact
  • Support and Subscriptions
  • Moderation philosophy and policy
  • Privacy Policy
  • Disqus Help Page

Copyright © 2026 | MH Magazine WordPress Theme by MH Themes