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Posts

July 01, 2015

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12:30 PM | 7/1/15
7 = 1 + 1 + 5
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10:59 AM | Of Sheep, Literalism, and Language
I got a kick out of Evelyn Lamb's latest posting at her "Roots of Unity" blog:http://blogs.scientificamerican.com/roots-of-unity/the-unbearable-literalism-of-being-a-mathematician/I enjoyed two things in particular: First she employs one of my favorite old math jokes... about the astronomer, physicist, and mathematician (in her rendition) who see a black sheep in a Scottish field... I won't
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7:30 AM | Inspecting the Mine Puzzle - Henry Dudeney
7/01/2015Here is another puzzle by Henry Dudeney, from his book "Amusement in Mathematics": […]
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7:01 AM | Infinity Plus One: Please Check Your Intuitions at the Front Desk
Infinity shreds our intuitions. Continue reading →
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5:00 AM | (x, why?) Mini: Nonagon
(Click on the comic if you can't see the full image.) (C)Copyright 2015, C. Burke.From the Italian for "Grandma-gon". More formally as Nonna-gon. Come back often for more funny math and geeky comics.

June 30, 2015

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10:52 PM | Fast Formulas #6: Finding the Time
  The Fast Formulas on this blog provide shortcut calculations for financial instruments such as mortgages and bonds. Most formulas involve the symbol n to represent the number of periods (e.g. years or months) until the end of the instrument. Usually … Continue reading →
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10:45 PM | Why Can’t You Divide By 0? Why Siri Is Correct (Kind Of)
Once again, a math problem has gone viral. And like Cheryl’s birthday problem, once again the buzz is accompanied with disparaging comments against women. What is 0 divided by 0? Apple included a joke in its iPhone. If you ask this to Siri, “she” gives the response: Imagine that you have zero cookies and you … Continue reading Why Can’t You Divide By 0? Why Siri Is Correct (Kind Of)
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9:21 PM | Algebra Fact on Twitter: "The last digit of any integer and its fifth power are the same."
Algebra Fact on Twitter: "The last digit of any integer and its fifth power are the same."
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5:30 PM | #LoveWins! LGBTQ Bloggers Make Their Voices Heard
We're so proud to provide a platform for all the incredibly talented LGBTQ writers who are advocating for change and sharing their stories on WordPress.com.
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3:23 PM | June Favorites
It’s the end of June and I have no idea how this month pasted so quickly. So many things happened for me this month. First of all I graduated and it was quite overwhelming (it was a combination of being proud, scared and excited at the same time). Here is a photo from the event: […]
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12:45 PM | The Water Tower Problem and the Perils of Rounding
Question 34, the first Part IV question of the New York State Geometry (Common Core) Regents exam for June 2015, read as follows: The water tower in the picture below is modeled by the two-dimensional figure beside it. The water tower is composed of a hemisphere, a cylinder, and a cone. Let C be the center of the hemisphere and let D be the center of the base of the cone. If AC = 8.5 feet, BF = 25 feet, and m∠EFD = 47°, determine and state, to the nearest cubic foot, the volume of the […]
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12:30 PM | 6/30/15
6 = 30 * 1 / 5Also:6 / (3 + 0) = √(|1 - 5|)
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8:30 AM | Leap Second
6/30/2015Just in case you did not get your memo from NASA:Before you go to bed tonight, move your clocks ahead by 1 second.  NASA is adding a leap second tonight.The last leap second that was added occurred in 2012.  So they don't happen often.  But with a few exceptions, I don't think most people will notice the change.  Still it will be refreshing to know that we will all get an extra second of sleep tonight.Source: […]
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7:30 AM | True or False
6/30/201563,015 is a 602-gonal, 6,303-gonal, and a 21,006-gonal number.  It is a composite, deficient, Harshad, odd, Smith, sphenic, square-free, and unprimable number.Have you ever heard the rule that "There is an exception to every rule."?Is that rule true or false?If a rule had an exception then that rule would be false.  Take the spelling rule "i before e, except after c".  I think it is a weird rule.  In the word "weird" the i does not come before the e, and there is no […]
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2:19 AM | hyrodium:LTNS:)I made an animation of Lorenz Attractor.Long...
hyrodium:LTNS:)I made an animation of Lorenz Attractor.Long version: https://www.youtube.com/watch?v=v6UABhdh_lA
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2:17 AM | Matching markets book, Why we hate secrets, U.S. families can now negotiate with terrorists, strategic apathy in soccer, and why the President should get fast-track authority – Game Theory In The News
When I mention I blog about game theory, most people have no idea about the subject, and a few people know it has something to do with the prisoner’s dilemma. Then I give a few examples of game theory and people usually want to learn more. I write the monthly series “game theory in the … Continue reading Matching markets book, Why we hate secrets, U.S. families can now negotiate with terrorists, strategic apathy in soccer, and why the President should get fast-track authority […]
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12:00 AM | Space Needle Climb
I'm climbing the Seattle Space Needle to raise money for cancer research.

June 29, 2015

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10:58 PM | Hyperboloid
Hyperboloid
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6:41 PM | MATH
[...]
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5:40 PM | July in Blogging U.: Blogging 101 and 201
Need help getting your blog off the ground or getting readers engaged?
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1:03 PM | A Re-run Monday
I was reading the first of Greg Ross's "Futility Closet" volumes when I came across one of my favorite old puzzles, that was last presented here over 2 years ago. I originally learned of it from Richard Wiseman's blog and again I'll opt for Richard's version of it (most readers here are likely already familiar with it): "Imagine there is a country with a lot of people. These people do not die,
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12:30 PM | 6/29/15
|6 - 2 - 9| = 1 * 5Also:|(6 / 2) - 9| = 1 + 5
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12:05 PM | Summer To-Do Diagram
(Click on the comic if you can't see the full image.) (C)Copyright 2015, C. Burke.It's oddly accurate while leaving out a whole lot of stuff. But definitely the proofreading! There are new curriculums to be learned, and I need to refresh in upper-level classes in case I'm called to teach those. And now is a good time to assess what worked and what didn't -- particularly, with the new material which I hadn't taught in the same manner before. So I'm not really off. ... except that I am. […]
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11:00 AM | Siobhan Roberts... Playing With Geniuses
 Math-Frolic Interview #33  “John Conway is, by any standard, a very remarkable man, and he well deserves a remarkable biography, which this book undoubtedly is. Siobhan Roberts expertly conjures up a genuine picture of the man and his amazing world.”   —Roger Penrose If you don't already know the name Siobhan Roberts it's probably just a matter of a little more time. She is an
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9:15 AM | Photo
No summary available for this post.
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7:30 AM | Brain-O Quiz Answers
6/29/20156,292,015 is a composite, Duffinian, odd, semiprime, square-free and unprimeable number. […]
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1:35 AM | Photo
No summary available for this post.

June 28, 2015

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10:36 PM | curiosamathematica: Happy τ-day!
curiosamathematica: Happy τ-day!
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8:23 PM | Where Is The Car Parked? Viral Math Problem From Hong Kong, Plus 2 Variations. Sunday Puzzle
This mathematical question was asked to elementary students in Hong Kong. Students had 20 seconds to answer it. The problem went viral in 2014 because it stumped many adults. It went viral again recently because adults who see the problem for the first time still get confused. I was inspired by the problem to create … Continue reading Where Is The Car Parked? Viral Math Problem From Hong Kong, Plus 2 Variations. Sunday Puzzle
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7:18 PM | Boost Performance of your Low End Computer to a new level
Visit the original post Boost Performance of your Low End Computer to a new level for the best experience of reading!
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