tag:blogger.com,1999:blog-1227172931607686978.comments2017-08-29T09:35:05.953-04:00Math-Frolic!"Shecky Riemann"http://www.blogger.com/profile/07065658607024191185noreply@blogger.comBlogger228125tag:blogger.com,1999:blog-1227172931607686978.post-1115520517676315892017-08-29T09:35:05.953-04:002017-08-29T09:35:05.953-04:00A little history midway through this old piece of ...A little history midway through this old piece of mine: http://bit-player.org/bph-publications/SciAm-1984-01-Hayes-hailstone.pdf. <br /><br />Best source: The Ultimate Challenge: The 3x+1 Problem, ed. by Jeff Lagarias, published by AMS, reprints an article by Collatz himself "On the Motivation and Origin of the (3n+1)-Problem."bit-playerhttps://www.blogger.com/profile/10925013458053903295noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-91749921063476322402017-08-23T07:48:43.210-04:002017-08-23T07:48:43.210-04:00I think I'll use this as a math history assign...I think I'll use this as a math history assignment this semester. Pick a name, make a case! I'll find it difficult to choose, but I think have it narrowed down to Robinson or Thurston.<br /><br />Of course, might be benefits to having a statue of an immigrant as well.John Goldenhttps://www.blogger.com/profile/18212162438307044259noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-53160185150425773642017-02-15T09:38:11.534-05:002017-02-15T09:38:11.534-05:00OK, thanks, he actually does that in a number of h...OK, thanks, he actually does that in a number of his books, which is partly why I think, despite his multi-talents and prolific writing, he never gained the following that Martin Gardner had being a much more succinct, smooth writer.<br /><br />"Shecky Riemann"https://www.blogger.com/profile/07065658607024191185noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-76037136278972547832017-02-15T08:26:58.449-05:002017-02-15T08:26:58.449-05:00Be warned: I did not appreciate Reflections. It st...Be warned: I did not appreciate <i>Reflections</i>. It startes good, but in the second half of the book Smullyan rambled too much..mau.https://www.blogger.com/profile/09641196427325175260noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-7736910154782454472017-02-14T04:29:32.050-05:002017-02-14T04:29:32.050-05:00Even if Smullyan published books until last year, ...Even if Smullyan published books until last year, I think his pop fame was in the 80s: this could be a reason why there are so few obituaries. I am startled that the Washington Post did not have one, but as for the other newspapers it's just a matter of "things of the past", rather than canary. After all, I don't think that neither the Donald nor his friends care a damn whether .mau.https://www.blogger.com/profile/09641196427325175260noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-50306128816195763852016-10-20T23:00:59.869-04:002016-10-20T23:00:59.869-04:00Thanks a lot for motivating. The collection of boo...Thanks a lot for motivating. The collection of books stands at 155 now. My librarian is gracious enough to acquire most of them...JOSEPH VARGHESE Kureetharahttps://www.blogger.com/profile/02019655032384454831noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-27696669425364180212016-09-17T21:32:45.771-04:002016-09-17T21:32:45.771-04:00A bit less work, "next to last".A bit less work, "next to last".Neil Ostrovehttps://www.blogger.com/profile/03638059691645940108noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-82894715544898243032016-09-02T20:10:02.754-04:002016-09-02T20:10:02.754-04:00Not a computer genius here, not by far, but I had ...Not a computer genius here, not by far, but I had a recent problem when I used an ad blocker in a Chrome application. I wanted to open my Outlook work email account using a bookmark of the site.<br /><br />The site was locked, I was blocked, and then immediately a new attempt to reopen was initiated by the computer. The blocking and the re-initiation to open kept going in a cyclic fashion, until MathOughtshttps://www.blogger.com/profile/05020281340534425685noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-7745110449384394752016-08-16T17:29:59.530-04:002016-08-16T17:29:59.530-04:00Agreed. Love Numberphile. Thanks for the other lin...Agreed. Love Numberphile. Thanks for the other links.MathOughtshttps://www.blogger.com/profile/05020281340534425685noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-88095204154438564242016-07-03T22:37:13.094-04:002016-07-03T22:37:13.094-04:00have you had any news on this challenge, i can'...have you had any news on this challenge, i can't seem to find what the challenge even is,<br /><br /><br />thanks,<br /><br />gabegggnoreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-57101081410594299372016-06-15T01:34:34.456-04:002016-06-15T01:34:34.456-04:00Sublime.
Sublime.<br />David Langahttps://www.blogger.com/profile/09034899335717111526noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-27345592046979466612016-06-12T17:46:37.122-04:002016-06-12T17:46:37.122-04:00Thanks. Good seeing this again.
Wonder how many o...Thanks. Good seeing this again.<br /><br />Wonder how many of those math concepts I would identify. MathOughtshttps://www.blogger.com/profile/05020281340534425685noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-38992074886146079072016-06-07T07:53:35.478-04:002016-06-07T07:53:35.478-04:00==> the correct answer is indeed 76. Will Short...<br />==> the correct answer is indeed 76. Will Shortz gives it here:<br />http://tinyurl.com/hp2phtg<br /><br />[the tricky part (to me) is to consider the first set going to a 7-5 outcome rather than a 6-4 outcome]"Shecky Riemann"https://www.blogger.com/profile/07065658607024191185noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-73990502884317500292016-06-03T18:54:42.407-04:002016-06-03T18:54:42.407-04:00I guess Spanish numbers would go to either 5 (cinc...I guess Spanish numbers would go to either 5 (cinco) or a cycle 4 (cuatro)<->6(seis)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-73189380709075607412016-06-02T21:04:40.726-04:002016-06-02T21:04:40.726-04:00Speaking of fiction, John, reminds me of a novel M...Speaking of fiction, John, reminds me of a novel Martin Gardner highly recommended called "Popco" by British author Scarlett Thomas, that apparently includes lots of recreational mathematics. (I've never read it, but if Gardner highly touts it, it's no doubt good.)<br /><br />Donald Knuth's "Surreal Numbers" also comes to mind.<br /><br /><br />"Shecky Riemann"https://www.blogger.com/profile/07065658607024191185noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-74244567988102710802016-06-02T15:19:34.448-04:002016-06-02T15:19:34.448-04:00Sawyer has several neat older books of problems.
...Sawyer has several neat older books of problems.<br /><br />I'm not sure it's recreational for a general audience, but Professor Posey's Perplexing Problems.<br /><br />Socks Are Like Pants (Rosenfeld and Hamilton) and This is Not a Math Book (Weltman) and Patterns of the Universe (Bellos and Harriss) are some newer ones.<br /><br />What about fiction with math problems, like The John Goldenhttps://www.blogger.com/profile/18212162438307044259noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-50437585529887255372016-06-02T03:34:00.019-04:002016-06-02T03:34:00.019-04:00Hi, Shecky!
I would add to the latter list some bo...Hi, Shecky!<br />I would add to the latter list some books by Raymond Smullyan (at least <i>The lady or the tiger?</i> and <i>What is the name of this book?</i>.<br /><br />As for mathematical problems, I'd add <i>The Moskow Puzzles</i> by Boris Kordemsky and <i>Mathematical Quickies</i> by Charles Trigg. There are also a lot of books more difficult or too much easy, of course :-)<br />.mau.https://www.blogger.com/profile/09641196427325175260noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-91842308056437216162016-05-30T10:29:24.305-04:002016-05-30T10:29:24.305-04:007676Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-21514711115976599552016-05-24T00:49:17.365-04:002016-05-24T00:49:17.365-04:00An important (relatively speaking, of course) corr...An important (relatively speaking, of course) corrective to the WSJ article:<br /><br />http://www.slate.com/articles/life/gaming/2016/05/have_nigerian_players_developed_an_amazing_new_scrabble_strategy_don_t_believe.htmlJaredhttps://www.blogger.com/profile/14814865378470032462noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-62509225989233811412016-03-21T14:31:20.664-04:002016-03-21T14:31:20.664-04:00Just to clarify, something that was kind of glosse...Just to clarify, something that was kind of glossed over in the articles about it is that Lemke Oliver's and Soundararajan's work has results (provable assuming the Hardy-Littlewood k-tuple conjecture) about prime tuples of all sizes, so it's unlikely that anyone will discover something new about those this year. (It's still fun to play with for yourself, though.) If you dig into Evelynhttps://www.blogger.com/profile/08903667625039887922noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-21875280058925018052016-03-03T07:26:56.771-05:002016-03-03T07:26:56.771-05:00I knew about the 5x5 version publicized by Martin ...I knew about the 5x5 version publicized by Martin Gardner, but I did not know that here in Italy it had been popular for a while!.mau.https://www.blogger.com/profile/09641196427325175260noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-7446397031431432512016-01-19T20:53:40.239-05:002016-01-19T20:53:40.239-05:00It is not that surprising if we assume that Fermat...It is not that surprising if we assume that Fermat used what we call Fermat's factoring method. Upon multiplying by the cofactor of 8 (and using difference of pronic numbers instead of squares since the number is now even) he would find this pair of factors on the first try. (I am assuming that taking the square root of a 12-digit number was feasible. Also, I have no idea how difficult it Walthttps://www.blogger.com/profile/05235362518037728416noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-13361555068515731802015-12-17T09:41:11.468-05:002015-12-17T09:41:11.468-05:00Thanks for the plug, Shecky. I almost used the 66...Thanks for the plug, Shecky. I almost used the 666 explanation from Siobhan, which is also in Conway's biography. Pat Ballewhttps://www.blogger.com/profile/15234744401613958081noreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-4351022690800114562015-11-09T08:37:56.212-05:002015-11-09T08:37:56.212-05:00In a game like Bridge, if you are drawing trump yo...In a game like Bridge, if you are drawing trump you may be worried about a 3-1 split just as much as a 1-3 split. In either case you will have to draw 3 rounds of trump. So what she is saying would make a little more sense if she was coming to the question from that angle. Even still I think her answer is misleading. Dan Loebhttp://pjvoice.org/author/loebnoreply@blogger.comtag:blogger.com,1999:blog-1227172931607686978.post-64001639792815326842015-11-09T07:51:07.006-05:002015-11-09T07:51:07.006-05:00She looks smarter if she can say something non-int...She looks smarter if she can say something non-intuitive.John Goldenhttps://www.blogger.com/profile/18212162438307044259noreply@blogger.com