Auteur/autrice : Fred
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US 7,096,473
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Hats Calculator (2/3)
This is the second in a series of three exercices de style to show some interesting aspects of the game of hats: a puzzle which was initially proposed by Lionel Levine. First exercice Second exercice Third exercice Here we introduce the hats calculator: a toy application which implements the operations introduced in the first exercice. […]
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Towers of hats (1/3)
This is the first in a series of three exercices de style to show some interesting aspects of the game of hats: a puzzle which was initially proposed by Lionel Levine, and arose from his work with Tobias Friedrich on
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git filter-repo
Eventually you will commit a huge file to your git repository by mistake. Use git-filter-repo to remedy the situation. Installation: Example:
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Schizo: a different sudoku solving technique
Over the years, several tips and techniques have been developed to help solve sudoku puzzles with logic rather than brute force. To name a few, sudoku9x9 mentions (among others) hidden single, naked single, x-wing.
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Facebook Die Hard
J’ai demandé la suppression permanente de mon compte facebook en 2013. J’ai été tranquille pendant quelques années. Depuis 2017 curieusement, Facebook s’est mis à me spammer avec des emails réguliers intitulés revenez sur Facebook en un clic, ou encore connectez-vous à Facebook en un clic. Le dernier date du 29 mai 2020:
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Murder in the third degree?
On Friday, May 29th, four days after the video-recorded, snuff-style, lynch-style, cold-blooded murder of George Floyd by four officers of the police of Minneapolis, Minnesota, one of the officers was charged with third degree murder by Hennepin County Attorney Mike Freeman.
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A Karen
On Monday May 25th, Christian Cooper had an unpleasant encounter with Amy « Karen » Cooper.
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Mark Sucker-berg
In response to Twitter having fact-checked two posts by President donald trump, Mark Zuckerberg pandered to the White House during an interview on Fox News: “We have a different policy, I think, than Twitter on this […] I just believe strongly that Facebook shouldn’t be the arbiter of truth of everything that people say online […]
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IMO 2019 Problem 1
An exercice with MathJax Problem 1: Let $\mathbb{Z}$ be the set of integers. Determine all functions $f : \mathbb{Z} \rightarrow \mathbb{Z}$ such that \begin{equation}\forall (a, b) \in \mathbb{Z} \times \mathbb{Z}, \quad f(2a) + 2 f(b) = f(f(a + b))\label{eq1}\end{equation}
