-
Recent Posts
Subscribe to Complex Projective 4-Space
Join 2,972 other subscribersArchives
- July 2024
- January 2024
- July 2023
- March 2023
- February 2023
- January 2023
- October 2022
- September 2022
- July 2022
- June 2022
- May 2022
- January 2022
- December 2021
- September 2021
- July 2021
- June 2021
- May 2021
- February 2021
- January 2021
- December 2020
- November 2020
- October 2020
- September 2020
- August 2020
- July 2020
- June 2020
- May 2020
- June 2019
- May 2019
- March 2019
- November 2018
- September 2018
- July 2018
- June 2018
- May 2018
- April 2018
- March 2018
- February 2018
- November 2017
- October 2017
- November 2016
- May 2016
- March 2016
- February 2016
- December 2015
- September 2015
- March 2015
- February 2015
- January 2015
- December 2014
- November 2014
- October 2014
- September 2014
- August 2014
- July 2014
- June 2014
- May 2014
- April 2014
- March 2014
- February 2014
- January 2014
- December 2013
- November 2013
- October 2013
- September 2013
- August 2013
- July 2013
- June 2013
- May 2013
- April 2013
- March 2013
- February 2013
- January 2013
- December 2012
- November 2012
- October 2012
- September 2012
- August 2012
Recent Comments
Monthly Archives: April 2014
Golygons and golyhedra
A most delightful way to procrastinate is to attempt the unsolved problems on MathOverflow. Especially rewarding is when you actually end up solving such a problem, or when you learn something in the process, or both. Last night I learnt … Continue reading
Posted in Uncategorized
10 Comments
Orchestral biography of Turing
Whilst submerged beneath several blankets in my morning hypnopompia, I was awakened by the Today programme on Radio 4. Specifically, I heard news that the Pet Shop Boys are due to perform an orchestral biography of the mathematician and cryptanalyst … Continue reading
Posted in Uncategorized
1 Comment
Cipher 66: Hash inversion
Yes, this is designed to be deliberately difficult: 15fbaa066a407be6ca5d86838b756d3d Enjoy…
Posted in Ciphers
Leave a comment
Poncelet’s porism: the Socratic dialogue
In the 1994 proceedings of the Mathematical Association of America, there is a truly wonderful article by Jonathan King. Entitled Three Problems in Search of a Measure, it provides three very different examples of problems that can be solved using elementary … Continue reading
Posted in Uncategorized
3 Comments
Cipher 65: Melencolia
Firstly, congratulations to the British EGMO team (Olivia, Kasia, Katya and Eloise) for their impressive performance, coming eighth out of 29 competing teams. Apparently the competition was held in the same five-star hotel in Antalya enjoyed by a previous Balkan … Continue reading
Posted in Ciphers
Leave a comment
Lifting the exponent
I overheard mention of a particular problem on a recent British Mathematical Olympiad, namely the following: A number written in base 10 is a string of 3^2013 digit 3s. No other digit appears. Find the highest power of 3 which … Continue reading
Posted in Uncategorized
Leave a comment
Cipher 64: Sic transit gloria Monday
Firstly, I have a few late items of news to discuss: Maria Holdcroft (former UK EGMO team member) and I survived our skydive on Wednesday, and have so far raised in excess of £886.77 (a large portion of which is from … Continue reading
Posted in Uncategorized
Leave a comment
Cayley-Menger determinants
Niccolo Fontana Tartaglia, whom you may recognise from having discovered Cardano’s solution to the general cubic equation, also discovered a generalisation of Heron’s formula to compute the volume of a tetrahedron: As you may expect, this can be generalised to … Continue reading
Posted in Uncategorized
6 Comments