[math-fun] Problem Puzzler 1999
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution. I have the solution, sent this morning to J.-P. Delahaye. Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in: http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article? Christian.
Christian, Yes, a spreadsheet with all solutions is near the bottom of my column. --Ed Pegg Jr --- Christian Boyer <cboyer@club-internet.fr> wrote:
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution.
I have the solution, sent this morning to J.-P. Delahaye.
Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in:
http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html
Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article?
Christian.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Two new puzzles: 1) Changing ONE AND ONLY ONE sign in the original puzzle (Fig 7 at http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html, is it possible to get another puzzle having again only one solution? 2) Changing ONE AND ONLY ONE sign in the original puzzle, is it possible to get another puzzle with more than one solution? I have the 2 answers, hoping that they are correct. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de ed pegg Envoyé : jeudi 24 novembre 2005 21:20 À : math-fun Objet : Re: [math-fun] Problem Puzzler 1999 Christian, Yes, a spreadsheet with all solutions is near the bottom of my column. --Ed Pegg Jr --- Christian Boyer <cboyer@club-internet.fr> wrote:
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution.
I have the solution, sent this morning to J.-P. Delahaye.
Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in:
http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html
Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article?
Christian.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Nobody seems to have solved my 2 Sudoku problems asked one week ago. But I received direct emails asking me more information, mainly if the problems have unique/no/multiple solutions. No trap in my problems, the 2 answers of my initial questions below are YES. And more precisely: -Problem #1 below has a unique solution (only one new Sudoku puzzle allowing one solution) -Problem #2 below has a unique solution (only one new Sudoku puzzle allowing more than one solution) Who will find and confirm the 2 only signs, one for #1 and one for #2, that can be changed? With the solutions of these 2 new Sudokus. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : vendredi 25 novembre 2005 12:55 À : 'math-fun' Objet : RE: [math-fun] Problem Puzzler 1999 Two new puzzles: 1) Changing ONE AND ONLY ONE sign in the original puzzle (Fig 7 at http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html, is it possible to get another puzzle having again only one solution? 2) Changing ONE AND ONLY ONE sign in the original puzzle, is it possible to get another puzzle with more than one solution? I have the 2 answers, hoping that they are correct. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de ed pegg Envoyé : jeudi 24 novembre 2005 21:20 À : math-fun Objet : Re: [math-fun] Problem Puzzler 1999 Christian, Yes, a spreadsheet with all solutions is near the bottom of my column. --Ed Pegg Jr --- Christian Boyer <cboyer@club-internet.fr> wrote:
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution.
I have the solution, sent this morning to J.-P. Delahaye.
Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in:
http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html
Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article?
Christian.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
FYI, Jean-Paul Delahaye asks my 2 Sudoku problems below in the January 2006 issue of Pour La Science, the French edition of Scientific American. Two difficult problems... but unique solution exist for each of them. Who will be the first to solve them, or one of them? Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : dimanche 4 décembre 2005 23:22 À : 'math-fun' Objet : RE: [math-fun] Problem Puzzler 1999 Nobody seems to have solved my 2 Sudoku problems asked one week ago. But I received direct emails asking me more information, mainly if the problems have unique/no/multiple solutions. No trap in my problems, the 2 answers of my initial questions below are YES. And more precisely: -Problem #1 below has a unique solution (only one new Sudoku puzzle allowing one solution) -Problem #2 below has a unique solution (only one new Sudoku puzzle allowing more than one solution) Who will find and confirm the 2 only signs, one for #1 and one for #2, that can be changed? With the solutions of these 2 new Sudokus. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : vendredi 25 novembre 2005 12:55 À : 'math-fun' Objet : RE: [math-fun] Problem Puzzler 1999 Two new puzzles: 1) Changing ONE AND ONLY ONE sign in the original puzzle (Fig 7 at http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html, is it possible to get another puzzle having again only one solution? 2) Changing ONE AND ONLY ONE sign in the original puzzle, is it possible to get another puzzle with more than one solution? I have the 2 answers, hoping that they are correct. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de ed pegg Envoyé : jeudi 24 novembre 2005 21:20 À : math-fun Objet : Re: [math-fun] Problem Puzzler 1999 Christian, Yes, a spreadsheet with all solutions is near the bottom of my column. --Ed Pegg Jr --- Christian Boyer <cboyer@club-internet.fr> wrote:
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution.
I have the solution, sent this morning to J.-P. Delahaye.
Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in:
http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html
Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article?
Christian.
FYI, first correct solutions to my 2 difficult Sudoku problems found last week by Louis Caya, Canada. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : jeudi 22 décembre 2005 10:17 À : 'math-fun' Objet : RE: [math-fun] Problem Puzzler 1999 FYI, Jean-Paul Delahaye asks my 2 Sudoku problems below in the January 2006 issue of Pour La Science, the French edition of Scientific American. Two difficult problems... but unique solution exist for each of them. Who will be the first to solve them, or one of them? Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : dimanche 4 décembre 2005 23:22 À : 'math-fun' Objet : RE: [math-fun] Problem Puzzler 1999 Nobody seems to have solved my 2 Sudoku problems asked one week ago. But I received direct emails asking me more information, mainly if the problems have unique/no/multiple solutions. No trap in my problems, the 2 answers of my initial questions below are YES. And more precisely: -Problem #1 below has a unique solution (only one new Sudoku puzzle allowing one solution) -Problem #2 below has a unique solution (only one new Sudoku puzzle allowing more than one solution) Who will find and confirm the 2 only signs, one for #1 and one for #2, that can be changed? With the solutions of these 2 new Sudokus. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : vendredi 25 novembre 2005 12:55 À : 'math-fun' Objet : RE: [math-fun] Problem Puzzler 1999 Two new puzzles: 1) Changing ONE AND ONLY ONE sign in the original puzzle (Fig 7 at http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html, is it possible to get another puzzle having again only one solution? 2) Changing ONE AND ONLY ONE sign in the original puzzle, is it possible to get another puzzle with more than one solution? I have the 2 answers, hoping that they are correct. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de ed pegg Envoyé : jeudi 24 novembre 2005 21:20 À : math-fun Objet : Re: [math-fun] Problem Puzzler 1999 Christian, Yes, a spreadsheet with all solutions is near the bottom of my column. --Ed Pegg Jr --- Christian Boyer <cboyer@club-internet.fr> wrote:
Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution.
I have the solution, sent this morning to J.-P. Delahaye.
Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in:
http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html
Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article?
Christian.
_______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Two articles. 1) In the next issue of Scientific American will be published the English translation of the excellent article of Jean-Paul Delahaye on Sudokus, initially published in French in the December 2005 issue of Pour La Science (see below my old email). 2) And in the next issue of Pour La Science, I will publish an article titled "Les ancêtres français du Sudoku" ("French ancestors of Sudoku") about a forgotten information, even in France: several French newspapers, end XIXth century, published numerous 9x9 grids very close, or using, Sudoku puzzles. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : jeudi 24 novembre 2005 19:51 À : 'math-fun' Objet : [math-fun] Problem Puzzler 1999 Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution. I have the solution, sent this morning to J.-P. Delahaye. Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in: http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article? Christian. _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
I found the > puzzle in Ed's article to be the most interesting, more so than regular Sudoku. I solved it over a few days. Nothing dramatic, but a couple of new reasoning ideas. I have a memory of several other solvers, but it's faded. Of course the bigger puzzle is how these are devised. Will an English version of your history article be available? The 15-puzzle was popular in the late 1800's, and I wonder if there are cycles in the popularity of "math-ish" puzzles? Rich -----Original Message----- From: math-fun-bounces+rschroe=sandia.gov@mailman.xmission.com on behalf of Christian Boyer Sent: Wed 5/10/2006 8:47 AM To: 'math-fun' Subject: RE: [math-fun] Sudoku articles Two articles. 1) In the next issue of Scientific American will be published the English translation of the excellent article of Jean-Paul Delahaye on Sudokus, initially published in French in the December 2005 issue of Pour La Science (see below my old email). 2) And in the next issue of Pour La Science, I will publish an article titled "Les ancêtres français du Sudoku" ("French ancestors of Sudoku") about a forgotten information, even in France: several French newspapers, end XIXth century, published numerous 9x9 grids very close, or using, Sudoku puzzles. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : jeudi 24 novembre 2005 19:51 À : 'math-fun' Objet : [math-fun] Problem Puzzler 1999 Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution. I have the solution, sent this morning to J.-P. Delahaye. Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in: http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article? Christian. _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
Hello Rich, About the > puzzle, my (difficult) variation on it, asked in January in Pour La Science, has received only one correct answer, from a Canadian reader. Solution not yet published, other solvers are welcome. About the English version of my next article, two answers: -a press release (in two versions, French and English) summarizing the article is currently prepared by the magazine. If you wish, I will send you their press release in English, when it will be available. -Pour La Science will ask Scientific American (same press group) if they are interested by an English translation. If they are not interested, -and I think that they will not want to publish a second article on Sudokus- perhaps I will propose the article to another American magazine. Christian. _____ De : Schroeppel, Richard [mailto:rschroe@sandia.gov] Envoyé : mercredi 10 mai 2006 17:23 À : cboyer@club-internet.fr; math-fun@mailman.xmission.com Cc : Schroeppel, Richard; rcs@cs.arizona.edu Objet : RE: [math-fun] Sudoku articles I found the > puzzle in Ed's article to be the most interesting, more so than regular Sudoku. I solved it over a few days. Nothing dramatic, but a couple of new reasoning ideas. I have a memory of several other solvers, but it's faded. Of course the bigger puzzle is how these are devised. Will an English version of your history article be available? The 15-puzzle was popular in the late 1800's, and I wonder if there are cycles in the popularity of "math-ish" puzzles? Rich -----Original Message----- From: math-fun-bounces+rschroe=sandia.gov@mailman.xmission.com on behalf of Christian Boyer Sent: Wed 5/10/2006 8:47 AM To: 'math-fun' Subject: RE: [math-fun] Sudoku articles Two articles. 1) In the next issue of Scientific American will be published the English translation of the excellent article of Jean-Paul Delahaye on Sudokus, initially published in French in the December 2005 issue of Pour La Science (see below my old email). 2) And in the next issue of Pour La Science, I will publish an article titled "Les ancêtres français du Sudoku" ("French ancestors of Sudoku") about a forgotten information, even in France: several French newspapers, end XIXth century, published numerous 9x9 grids very close, or using, Sudoku puzzles. Christian. -----Message d'origine----- De : math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com [mailto:math-fun-bounces+cboyer=club-internet.fr@mailman.xmission.com] De la part de Christian Boyer Envoyé : jeudi 24 novembre 2005 19:51 À : 'math-fun' Objet : [math-fun] Problem Puzzler 1999 Jean-Paul Delahaye publishes in the new issue of Pour La Science a very interesting article on Sudokus. He asked a very strange Sudoku problem WITHOUT any given numbers, only ">" and "<" signs between cells. He mentions that this problem was published in Puzzler, 1999, and that he does not know the solution. I have the solution, sent this morning to J.-P. Delahaye. Now looking for "Puzzler 1999" on Google, I find that Ed Pegg Jr. wrote an article in September 2005 including the same astonishing puzzle, figure 7 "Greater Than Sudoku" in: http://www.maa.org/editorial/mathgames/mathgames_09_05_05.html Perhaps that somebody else had already the solution? Ed, did you receive a solution to your article? Christian. _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun
participants (3)
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Christian Boyer -
ed pegg -
Schroeppel, Richard