tag:blogger.com,1999:blog-5303307482158922565.comments2015-03-14T15:17:51.481-07:00Math Mama Writes...Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comBlogger2028125tag:blogger.com,1999:blog-5303307482158922565.post-71260330242018532212015-03-14T15:17:51.481-07:002015-03-14T15:17:51.481-07:00What a beautiful suite of books people will have t...What a beautiful suite of books people will have to help them change their perspective on math!Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-40839497874417986392015-03-14T14:59:59.355-07:002015-03-14T14:59:59.355-07:00Hoping to get at least three out this year, maybe ...Hoping to get at least three out this year, maybe four if I'm lucky. The "race" was for the paperback of my Let's Play Math, which has turned into a second edition with two new chapters and lots of extras. Planning for summer, or for back-to-school at the latest, barring unforeseen trouble.Denise Gaskinshttp://www.blogger.com/profile/11928843626113889088noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-1358656186787352162015-03-14T14:33:41.586-07:002015-03-14T14:33:41.586-07:00Nice! (I Knew linear connected to keeping vector s...Nice! (I Knew linear connected to keeping vector space properties, but you put it well. And thinking about "normalizing", by using z-score to equate the mean with z=0, makes it clear why you'd want that broader definition in statistics.)Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-39006368554485131902015-03-14T14:29:56.592-07:002015-03-14T14:29:56.592-07:00But aren't you going to put out a few books at...But aren't you going to put out a few books at once?Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-85014131755543484372015-03-14T08:26:51.687-07:002015-03-14T08:26:51.687-07:00Yay!
Even with all the delays, you win our race. ...Yay! <br />Even with all the delays, you win our race. :)Denise Gaskinshttp://www.blogger.com/profile/11928843626113889088noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-6795272406965219532015-03-14T08:19:01.484-07:002015-03-14T08:19:01.484-07:00Did you get your question answered about linear vs...Did you get your question answered about linear vs affine transformations and "math linear" vs "stats linear?" If not, here are some quick points:<br /><br />One key point in reconciling the stats and linear algebra definitions is that, with one important exception, key statistics are calculated relative to the distribution mean. The exception is the mean itself. This implies that other statistics, standard deviation, skewness, kurtosis, correlation, etc, are not affected when you add a constant. Further, that means most of the time statisticians move into a world where means are uniformly 0 and linear transformations are the same as in linear algebra.<br /><br />Now, why exclude X -> aX + b in linear algebra? Actually, these are called affine transformations and do have their own limelight of study. However, one (modern?) way of thinking is that linear transformations are the maps between vector spaces that preserve the vector space properties, thus are a natural place to focus.Joshua Greenehttp://www.blogger.com/profile/11702319994021721608noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-37954942821382669102015-03-13T19:16:12.729-07:002015-03-13T19:16:12.729-07:00Congratulations!!Congratulations!!SDadmehrhttp://www.blogger.com/profile/12478674481124549798noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-68160333987688210942015-03-13T16:32:34.299-07:002015-03-13T16:32:34.299-07:00I had a Skype lesson with Buddha Buck - he was gre...I had a Skype lesson with Buddha Buck - he was great, and I understood a lot. Unfortunately, I didn't practice right after, so I may have lost it. I think I should buy myself a slide rule, and play with it this summer. But if I need help, I now have a second willing tutor. Thanks!Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-47076238643922019432015-03-13T15:13:16.674-07:002015-03-13T15:13:16.674-07:00I just came across this post. Did you come to ter...I just came across this post. Did you come to terms with the slide rule yet? They are really very simple and incredibly smart inventions, and yes, they will help you to explain logarithms. That is their operating principle.<br /><br />I'm a retired engineer (Class of '68). We began to get electronic calculators while I was in graduate school. From the 10th grade in high school onward I relied on slide rules to get me through.<br /><br />I still have my beloved Post Versalog slide rule. It's made of bamboo, of all things. You know how people are raving nowadays over the qualities of bamboo as a design element? Heck, we engineers have known that forever. There never was a better slide rule.<br /><br />I'm posting anonymously, but I'm Charles Hethcoat. You can email me at chethcoat@oplink.net if you'd care to continue the discussion. We can walk through the design and operation of the slide rule.<br /><br />CHAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-64585713120468626152015-03-02T20:39:19.373-08:002015-03-02T20:39:19.373-08:00What do you think?What do you think?Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-34033359347111257572015-03-02T15:40:11.829-08:002015-03-02T15:40:11.829-08:00is it kevin
is it kevin<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-67304262919703579492015-02-27T20:56:11.736-08:002015-02-27T20:56:11.736-08:00I'm currently taking a course on programming a...I'm currently taking a course on programming algorithms at SDSU and it is by far the most math-intensive computer science course there is. I think it'd be very useful to learn how to come up with a formula for a problem like you have. It seems like an essential skill for writing programs designed to calculate an answer for a problem.CMD619http://www.blogger.com/profile/17959687959176018305noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-68007584727417815922015-01-13T06:30:16.383-08:002015-01-13T06:30:16.383-08:00Thanks, Shireen!Thanks, Shireen!Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-71563201468879253952015-01-13T04:46:34.996-08:002015-01-13T04:46:34.996-08:00Hope your health issues clear up and leave you alo...Hope your health issues clear up and leave you alone .... pesky body! And Happy New Year!Shireen Dadmehrhttp://www.blogger.com/profile/16282965851939089408noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-89958181947653858522015-01-08T23:29:23.021-08:002015-01-08T23:29:23.021-08:00I organized the information visually in an array w...I organized the information visually in an array with the letters of the alphabet along the top row. As I listed each word (with the number of correct letters) on a new row, I put a dot under the letters that the word is composed of. When letters were eliminated, I crossed off the dots in that column. After STOMP and TRUCK eliminated UOT, the only letters possible from QUOTE were Q and E, and Q would be unlikely without the U. Therefore, one letter is (most likely) E. I circled the E column so that when I continued to list words, if I put a dot in the E column I knew that one letter of the new word listed was already spoken for. I continued filling in information on the chart, and didn't have any new leads until QUICK. (Actually the first time I worked it out I accidentally skipped over the word QUICK, which made it a bit more complicated, but still solvable!) Continuing with the assumption that Q was eliminated due to no U, the next letter must be I because C and K have already been eliminated. I circled the I column in my chart. Now, looking back at the word DIRTY, I eliminated D and Y.Since D, R, and Y have been eliminated, then LARDY gives us both A and L. I circled those columns.Now looking back and BLAND, I can eliminate B and N. Looking back at FLASH, I eliminate F and H. Looking back at VOWEL, I eliminate V and W. BINDS gives no new information since I already know I, and the other letters have all been eliminated. NIGHT gives us the G since N, H and T have been eliminated and we already know I. We now have 5 letters, A, E, G, I, and L, and playing around with them a bit leads me to AGILE. We don't need to use LINER, but it's a good confirmation. Sorry if it was a spoiler! I'm happy to email you my chart if the explanation was confusing. Fun game! Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-55204307451980391012015-01-08T09:42:12.794-08:002015-01-08T09:42:12.794-08:00Some further thoughts. Spoilers if people don'...Some further thoughts. Spoilers if people don't want to know:<br />TRUCK 0 and QUICK 1 implies QUI 1. Since Q needs a paired U, QU being correct means 2 right, so we have UI 1, so either U or I are in the final word.<br />STOMP 0 and EXITS 2 implies EXI 2. <br />TRUCK 0 and LINER 3 means LINE 3. <br /><br />This gives us the following possibilities:<br />U (not I) then EX and LN, so EXLNU. Doesn't fit with LARDY 2, so we conclude I is a letter, not U.<br />QUOTE 1 then means E is a letter, so we have E, I + {L or N}. <br />DIRTY 1 and LARDY 2 means we must have L.<br /><br />Now, we're at E I L.<br /><br />BINDS 1 and BLAND 2 implies A.<br />FLASH 2 and NIGHT 2 implies G.<br /><br />Now, we have E I L G A.<br />Joshua Greenehttp://www.blogger.com/profile/11702319994021721608noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-32571783721191006202015-01-08T09:20:13.161-08:002015-01-08T09:20:13.161-08:00I'm trying to think of a useful way to organiz...I'm trying to think of a useful way to organize the information you get at each guess. Still no great approach.<br /><br />My temptation following STOMP would have been to pursue 2 letter modifications, like<br />SWAMP<br />SLUMP<br />STOCK<br /><br />Though this seems similar a strategy mentioned in Chris Okasaki's blog that he declares sub-optimal.Joshua Greenehttp://www.blogger.com/profile/11702319994021721608noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-29692318537371874352015-01-08T07:29:45.390-08:002015-01-08T07:29:45.390-08:00Glad to bring back memories, Shecky.
Anonymous, c...Glad to bring back memories, Shecky.<br /><br />Anonymous, can you tell us how you got that word?Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-56652455674341836742015-01-08T00:14:32.002-08:002015-01-08T00:14:32.002-08:00AGILE :)AGILE :)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-32674654344420333972015-01-07T08:51:32.323-08:002015-01-07T08:51:32.323-08:00Yes, growing up in the midwest (1950s), "Jott...Yes, growing up in the midwest (1950s), "Jotto" was our favorite family game (even though we knew of no other households familiar with it). Great game, that can be played online now, but I've not seen it in a store in forever. BTW, in the original game you could choose 5-letter words with multiple same-letters, like "state" or "puppy" which made for deliciously-difficult games. <br />Anyway, you brought back memories!"Shecky Riemann"http://www.blogger.com/profile/07065658607024191185noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-37158619828897170932015-01-06T20:28:16.516-08:002015-01-06T20:28:16.516-08:00I love your post! Yep, this looks like Jotto. But ...I love your post! Yep, this looks like <a href="http://en.wikipedia.org/wiki/Jotto" rel="nofollow">Jotto</a>. But I like my name better, since it's a legal word in the game. And I like your version too.Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-28702592167968625972015-01-06T19:33:31.968-08:002015-01-06T19:33:31.968-08:00This game used to be sold under the name "Jot...This game used to be sold under the name "Jotto". For 5 letters, I need to be able to keep notes. But the same game using only 3 letters (4 if you're really ambitious) can easily be played without any note-taking and, in pre-smartphone days, used to be a family favorite to kill time while driving or waiting in line. Here's a write-up of one particularly memorable session: http://okasaki.blogspot.com/2008/04/games-for-programmers-jotto.htmlChris Okasakihttp://www.blogger.com/profile/18247315355264748920noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-53118208119214841242014-12-22T07:46:29.440-08:002014-12-22T07:46:29.440-08:00Leanne, I'm not sure what you're asking. T...Leanne, I'm not sure what you're asking. There are 268 triangles in that 4x4 picture in the post. To find them takes a lot of work, and it's a lot more interesting if you're trying to find patterns, and understand them.Sue VanHattumhttp://www.blogger.com/profile/10237941346154683902noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-3296133329226168892014-12-20T22:54:47.764-08:002014-12-20T22:54:47.764-08:00so what is the correct answer?so what is the correct answer?Leanne Barkerhttp://www.blogger.com/profile/17739794646818272799noreply@blogger.comtag:blogger.com,1999:blog-5303307482158922565.post-57326989119256632152014-12-15T09:55:41.077-08:002014-12-15T09:55:41.077-08:00Yes you can also generate a set for N = power of p...Yes you can also generate a set for N = power of prime using projective plane theory (4, 8, 16, 9 27, 25, ...).<br />It is more complex than for N prime because calculation needs polynomials.<br /><br />It was demonstrated impossible for N=6 mathematically, and for N=10 by brute force search.<br />Anonymousnoreply@blogger.com