Blog Archives

MCMSki IV, Jan. 6-8, 2014, Chamonix (news #16)

December 30, 2013
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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #16)

I am now in Chamonix, a week before MCMSki IV. The town is packed with tourists from all over Europe, English being the dominant language. There is not much snow so far, even though some runs reach town. (I did ski in the nearby Les Houches today and the red runs were either icy or

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Le Monde puzzle [#847]

December 28, 2013
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Le Monde puzzle [#847]

Another X’mas Le Monde mathematical puzzle: A regular dice takes the values 4, 8 and 2 on three adjacent faces. Summit values are defined by the product of the three connected faces, e.g., 64 for the above. What values do the three other faces take if the sum of the eight summit values is 1768? 

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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #14)

December 26, 2013
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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #14)

The programs of the talks, posters and workshop are now printed and available on Speaker Deck (talks, posters, workshop). Please let me know if you spot anything wrong (even though it will not be reprinted!). This is presumably the last news item till Jan. 5 as I am almost off to Chamonix for a week

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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #14)

December 21, 2013
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MCMSki IV, Jan. 6-8, 2014, Chamonix (news #14)

We are quite glad to announce that, thanks to the support of several publishers (CRC Press/Taylor & Francis, Elsevier, and Springer-Verlag), there will be book prizes for both poster nights at MCMSki IV ! I was reminded of this possibility during O-Bayes 2013 and those publishers reacted both quickly and positively to my request (and

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Le Monde puzzle [#843]

December 13, 2013
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Le Monde puzzle [#843]

A straightforward Le Monde mathematical puzzle: Find integers x with 4 to 8 digits which are (a) perfect squares x=y² such that is also a perfect square; (b) perfect cubes x=y³ such that is also a perfect cube; (c) perfect cubes x=y³ such that is also a perfect cube (where denotes

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sudoku break

December 12, 2013
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sudoku break

While in Warwick last week, one evening after having exhausted my laptop battery, I tried the following Sudoku (from Libération): and could not even start. As it happened, this was a setting with no deterministic move, i.e. all free/empty entries had multiple possible values. So after trying for a while and following trees to no

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amazonly associated thanks (& warnin’)

December 8, 2013
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amazonly associated thanks (& warnin’)

Following a now well-established pattern, let me (re)warn (the few) unwary ‘Og readers that the links to Amazon.com and to Amazon.fr found on this blog are actually susceptible to earn me a monetary gain if a purchase is made by the reader in the 24 hours following the

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Le Monde puzzle [#843]

December 6, 2013
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Le Monde puzzle [#843]

A Le Monde mathematical puzzle of moderate difficulty: How many binary quintuplets (a,b,c,d,e) can be found such that any pair of quintuplets differs by at least two digits? I solved it by the following R code that iteratively eliminates quintuplets that are not different enough from the first ones, for a random order of the

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Le Monde puzzle [#842]

November 29, 2013
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Le Monde puzzle [#842]

An easily phrased (and solved?) Le Monde mathematical puzzle that does not require an R code: The five triplets A,B,C,D,E are such that and Given that find the five triplets. Adding up both sets of equations shows everything solely depends upon E1… So running an R code that checks for all possible values of

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Unusual timing shows how random mass murder can be (or even less)

November 29, 2013
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Unusual timing shows how random mass murder can be (or even less)

This post follows the original one on the headline of the USA Today I read during my flight to Toronto last month. I remind you that the unusual pattern was about observing four U.S. mass murders happening within four days, “for the first time in at least seven years”. Which means that the difference between

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