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Posts Tagged ‘mathematics

A Nice Bit of Hex on Pi

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Pi Toast


C50F6D6FF383F44239 . . . — CalcCrypto

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Written by macheide

14 March 2015 at 7:54 pm

Posted in mathematic

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Perfect π

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Pi Scientific CalcGot an iPhone? Bring up the Control Center by swiping up from the bottom of the screen. At the bottom center right of the Control Center, click the icon for the Calculator. Pi 240Or shortcut these first two steps by simply telling Siri, “Run Calculator.” With the Calculator onscreen, turn the device to landscape view to access the scientific calculator. Near the center of the bottom of the scientific calculator display, click the π button. The scientific calculator displays the value of pi rounded to 16 significant digits: 3.141592653589793. Without clearing the calculator, turn the device to portrait view; the simple calculator now displays the value of pi rounded to 9 significant digits: 3.14159265. Or shortcut all of these steps by asking Siri, “What is the value of pi?” — via Wolfram Alpha, to 29 significant digits: 3.1415926535897932384626433832. Or let Siri take it out farther by asking something like, “What are the first 240 digits of pi?”

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Written by macheide

6 March 2015 at 7:52 am

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Iff You See Her Say Hello

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I doubt I’m improperly disclosing too much about my work to tell that I was recently involved on a project that included discussion about whether a piece of emerging regulatory guidance might want to use the word “iff.” In the sense of the second definition stated at my link given here: the mathematical term of art. I had to smile: one of my favorite hobbies involves collecting iffs.

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Written by macheide

15 November 2014 at 5:44 am

Posted in deskjob

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Again Of Math and Metaphor

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Two books new to my home stacks —

AtwoodMorning in the Burned House, new poems by Margaret Atwood. One of two copies that were on the used bookstore’s poetry shelves, and the book has no marks nor signs of wear; so this might actually be a new book, picked up from some other bookseller’s leftovers rather than a previously owned book. One or two of the poems in this book, I may have read online before, I won’t know for sure until I’ve read through them, first reading to be done over the course of the new several weeks, with initial place being a temporary spot on Daystand. Permanent place will be on my key poetry shelf in the living room. Update — Yes, re-reading “Helen of Troy Does Counter Dancing” upon encountering it during transcription of the book’s TOC for my Poetry Register, that one I know I’ve read several times before; it’s been rather frequently passed along elsewhere. But then starting back at the beginning after a preliminary scan of first lines, I know I’ve not previously read the first poem here, “You Come Back” – that closing line is the sort of thing I tend to remember long, the sort of thing that sends that poem to my memorization queue, the spark that has Atwood high on my list of favorite poets, precisely the reason this purchase today was so nice a find.

linear algebraLinear Algebra, by Larry Smith. (The Amazon link here refers to the paperback reprint of the hardbound version I purchased.) First copyrighted in 1978, obviously this is not the same text used by the linear algebra college class I did well at during my second semester at Houghton in early 1973; as I recall, the cover of my linear algebra book back then was a deep blue. Although I’m currently also reading several other math books I own (notably, one on Fermat’s Last Theorem), I’ll be using this linear algebra text to re-launch my own personal mathematics study program, curriculum to follow shortly. Temporary place, as I begin its study: Sewing room book stack. Permanent place: living room math bookshelf.

Susan had been off at the sewing center picking up two machines she’d had off for repair work, but cautioned me against making any purchases at Half-Price Books without checking with her first, then carefully reiterating her caution lest I had thought her to merely be teasing with the running joke about how I’m not to be trusted in a bookstore with spare cash in my pocket — ah, she’s got a surprise coming for me! So I did text her and tried a follow-up phone call after I’d found the Atwood, both book approval attempts seeing no response as she went about her business. Which was what gave me the time to find the linear algebra text — bad enough to let me run free in a bookstore with spare cash, but give me spare time too and I’m seriously dangerous! Finally I simply took the chance and made my purchases without her pre-approved stamp, risking that she’d not managed to find the one Atwood poetry book I’d be most likely to jump at the chance to get, with the even greater risk (ummm, not?) that she’d be giving me a linear algebra textbook. The bookstore clerk had to hear me chat about it, so he took it seriously enough to tell me that the back of my sales receipt described a return policy, should it turn out that I’d matched Suzi’s gift choice. I won’t be needing to use that, thanks anyway.

bumper sticker [] - grolier


Written by macheide

22 July 2014 at 2:38 pm

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Of Math and Metaphor

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I would be willing to throw away everything else but that: enthusiasm tamed by metaphor.

— Robert Frost, “Education by Poetry”

My best poetry prof and my best math prof well understood what often generated open amusement among my college friends: how my intense interest in math crossed wires with my obsessions over poetry. Not merely the double major of English and mathematics in which I got my degree, but how easily I merged those two into one. Math to them was rigid logic and dry formula and exacting number; poetry to them was dreamy allusion and raw beauty and boundless imagination. My math prof knew poetry way better than that, and my poetry prof knew math way better than that, so they taught well and guided me into deeper and fuller knowledge and expertise and understanding.

Enthusiasm, yes, that wild unknown that Rimbaud spoke of, Frost’s “sunset raving” as ongoing as the ever-setting sun! And taming that recalls the Little Prince’s fox, not “owned by” or “controlled by” or any of the other mean slurs by armchair critics who have never known the intimacy of bright spark touching soft flesh, but “tamed by” with a familiarity that could as well been expressed as “metaphor tamed by enthusiasm.”

And metaphor! Ah, sweet metaphor, the very word of creativity itself. Is it really so surprising that my favorite and easiest math courses involved complex variables (crossing the real with the imaginary), flew through Laplace transforms, dreamt so strangely through number theory (think Gödel), excelled at abstract algebra? Abstract algebra, there’s one for the uninformed masses to misread: isn’t abstraction supposed to be at odds with concrete, rigid algebra? No, not at all, and at no other college math course did I fly as high and as far as easily as I did with abstract algebra, which involves extension of algebraic concepts arising from the real number system to other, more generalized systems. Ummmm, as in what poetry knows and loves as metaphor, people. Math and poetry really do perform the same services and serve the same ends, people.

And like as mathematics is recognized as the language of all science, not just of math itself but also of physics and of chemistry and of biology and of astronomy and of all science, so too is metaphor the language of all art, not just of poetry but of art and of music and of dance and of all art. Like as the supposed scientist who ignores his math will never know his own science well enough to really discover or to experiment or to teach, because he does so without his language of math, so too is the artist or musician who disrespects metaphor unable to truly create or share or teach, because he does so without his language of metaphor. Think there’s anyone so unique as to have ever done their science well without having an appreciation of math or created any good art or music without respecting metaphor? Yeah, well, that’s like the heroin addict thinking he’s going to be the one exception to be successful at finding nirvana through his needle; as in, no such exception exists. As science breathes math, likewise art breathes metaphor.

Both my math and poetry college profs taught this, and both practiced what they taught in their own professions. Which was what made them so good at what they did, so effective at what they taught. And each one experienced their own and the other’s sunset raving, and each one spoke and heard the other’s language. Math and poetry are really not so separate. And I have always been willing to know no other teacher but one who is willing to throw away everything else but that: enthusiasm taming and tamed by metaphor.

//] - quotated

Written by macheide

22 July 2014 at 5:49 am

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Doubling Back

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Two and two are four,
Four and four are eight,
Eight and eight are sixteen,
Sixteen and sixteen are thirty two.
Two and two are four…

I heard that counterpoint background to Danny Kaye’s portrayal of Hans Christian Andersen only once, at about the age of 10, when our neighbors invited us over to watch the movie on TV. For a little song like that to a little math-bent mind like mine always was, once was enough to have me singing the tune throughout my childhood. Sometimes to this day I can be heard singing it when the mood hits me.

When I felt like irritating my brothers or others, I would not continue it as in the movie, restarting each cycle at two each time. Instead, my second verse would go, “32 and 32 are 64, 64 and 64 are 128, 128 and 128 are 256, 256 and 256 are 512.” And then to be seriously demented and obnoxious, I was known to have gone higher from there, “512 and 512 are 1,024, …” and so on. I once took that out over ten verses on a band bus before I got shrieked at to have mercy on the other band members.

In 12th grade, I sat for a special test co-sponsored by the Society of Actuaries, little knowing then where my future career would take me. One question on that multiple-choice test was to choose the last digit of 2 to the 400th power minus 1. Raise your hands if you tried to multiply 2 by itself 400 times, go ahead, don’t be shy. Now, how many of you tried a little shortcut, via 2 times 2 is 4, 4 times 4 is 16, 16 times 16 is 256, 256 times 256 is . . . uh . . .?

I selected the correct answer almost immediately, and felt it no genius in doing so. We want only the final digit, so all other digits can be dropped out of our multiplications. So we proceed – 2, 4, 8, 6, 2, 4, 8, 6, 2, 4, 8, 6 . . . and even a near-dunce head such as mine doesn’t take more than that many cycles to figure out the pattern. So any power of 2 that is divisible by 4 will have 6 as its last digit, and 6 minus 1 is 5, which was the answer to the test’s question.

Near-dunce me, it took me over 40 years, until just today, for me to realize that the pattern that gave me the answer to that problem in 12th grade was exactly the same pattern I’d been singing since seeing the Hans Christian Andersen movie. Instead of continuing my song verses with the higher numbers, all I needed to do was to sing the song with only the final digits —

Two and two are four,
Four and four are eight,
Eight and eight take us back to six,
Six and six come back round to two.
Two and two are four…

Virtually every single thought I have ever had concerning mathematics has felt similar to me as this pattern. Right down to how slow my own head is for working it out, other than for the vision of it inside my head.

bumper sticker [] - adrien

Written by macheide

7 May 2012 at 9:11 pm

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