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Posts

April 26, 2015

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6:08 PM | Nicholas Kristof’s “Are you smarter than an 8th grader?” article
Saw Nicholas Kristof’s article today via a Cristina Milos tweet: The article links to a document showing a bunch of problems from the 2011 TIMSS exam. Three of those questions are included in the article. I thought it would be interesting to have my kids talk through those questions. My younger son isn’t home right…
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6:05 PM | You Can Flip A Coin In Google! But Does The Coin Flipper Have A Bug? Sunday Puzzle
Now you can flip a coin any time you have internet access! Search “flip a coin” in Google and you’ll get a coin flipping tool. Click “flip it” and you get an animation of a coin spinning until it resolves heads or tails. Pro tip: you can similarly “roll a dice” in Google. But is … Continue reading You Can Flip A Coin In Google! But Does The Coin Flipper Have A Bug? Sunday Puzzle
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5:36 PM | the distance of complex numbers makes complex numbers a metric space
newest corollary
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5:19 PM | calculating with complex conjugates proof
newest proof
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5:07 PM | calculating with complex conjugates
newest corollary
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5:04 PM | visualization of the multiplication of complex numbers
newest example
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5:02 PM | visualization of the addition of complex numbers
newest example
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4:46 PM | absolute value of complex numbers
updated definition
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4:45 PM | Hamada cherries in St Andrews
At this time of year, the streets and gardens of St Andrews are full of extraordinary cherry blossom. I have just learned the reason. In 1975, Zenya Hamada was given permission to create a replica of the Old Course (I … Continue reading →
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4:41 PM | Getting push polled by my union?
My union e-mails me surveys. The right way to get member sentiment is to let chapter discussions happen, filter up from Chapter Leader to District Rep to the leadership on the 14th Floor of 52 Broadway. Unfortunately, that chain is weak or broken. There are schools without Chapter leaders, chapter leaders who do not meet […]
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4:36 PM | extracting the real and the imaginary part of a complex number
newest corollary
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2:54 PM | Improve chemical computing complexity by a 1000 times factor, easily
That is, if autonomous computing molecules are possible, as described in the model shown in the Molecular computers. To be exactly sure about about the factor, I need to know the answer for the following question: What is the most complex chemical computation done without external intervention, from the moment when the (solution, DNA molecule, … Continue reading Improve chemical computing complexity by a 1000 times factor, easily →
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2:52 PM | An Tagen wie diesen…
Während ich zu Hause unser zahnendes Baby bespaße, wird meine Frau von einem entgegenkommenden LKW abgedrängt und schlitzt sich dabei an einem unsauber abgefrästen Abflussrohr Felgen samt Reifen kaputt. Meine Laune sinkt. Ich gebe das Baby in gute Hände, schnappe mir Ersatzreifen und will mit unserem Zweitwagen los. Der Schlüssel, … Continue reading →
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2:21 PM | dot product of complex numbers
newest definition
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2:21 PM | complex conjugate
updated definition
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1:57 PM | The “rope around the Earth” problem
My son ran into a version of the classic “rope around the Earth” problem yesterday. The common version of the problem goes something like this: You have a rope that goes all of the way around the Earth at the equator. If you wanted a second rope to also go all the way around the…
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1:37 PM | This year’s Atlantic Causal Inference Conference: 20-21 May
Dylan Small writes: The conference will take place May 20-21 (with a short course on May 19th) and the web site for the conference is here. The deadline for submitting a poster title for the poster session is this Friday. Junior researchers (graduate students, postdoctoral fellows, and assistant professors) whose poster demonstrates exceptional research will […] The post This year’s Atlantic Causal Inference Conference: 20-21 May appeared first on Statistical Modeling, Causal […]
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1:07 PM | Condolences
My thoughts are with the family and friends of my neighbor, friend and an incredibly thoughtful soul Dan who fell pursuing Mr. Everest, a victim of the quake. 
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12:30 PM | 4/26/15
4 - 2 = 6 + 1 - 5 Also: (4 + 2) / 6 = 1^5 Also: √4 = 2 = 6 + 1 - 5
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12:08 PM | Animaciones: Teselaciones de Penrose #Matemáticas #Geometría #Mosaicos #Arte
¿No te gustan las mates? ¿No te atrae la geometría? … Vale, respeto tu opinión, pero intentaré modificarla. Eso si, con argumentos. Tal vez, te pienses un poco más la respuesta tras ver los siguientes vídeos con animaciones sobre las…Read more →
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11:33 AM | Clin d'œil à MC Escher
Clin d'œil à MC Escher   by Artsmoonika   http://im-possible.info/english/art/montage/artsmoonika.html#drawing-hands   Author - https://www.flickr.com/photos/artsmoonika/
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11:30 AM | Miniature Worlds
"Mathematicians are explorers of many miniature mathematical worlds. Explorers often find the objects or phenomena that they discover novel and surprising and they do not always describe them accurately. Indeed, just because they are novel and surprising, early explorers may mis-describe them, misunderstand them, and give most misleading reports."It is only after much further study that the '
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11:21 AM | complex numbers are a field extension of real numbers proof
newest proof
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11:16 AM | Mr Men #13
Alternate:
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11:00 AM | Jim Henle Serves Up Math, Piping Fresh
"The Proof and the Pudding" by Jim Henle Back in February I called Michael Harris's "Mathematics Without Apologies" perhaps the oddest popular mathematics read I'd ever come across... and in a serious, philosophical and psychological way, it was. But now, just a couple months later I come across Jim Henle's short "The Proof and the Pudding," which is also one of the oddest math volumes I've
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10:56 AM | A Costly Proposition - a.k.
Now that we know the statistical properties of memoryless processes, being those in which the waiting time for the occurence of an event is independent of how long we have already been waiting for it, I think it would make for an interesting postscript to briefly cover how we might use them to model real world problems.
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10:44 AM | California water measurements – chains, links, and furlongs
Help your students understand what they are reading or hearing about the California drought.  Terms like acre-feet, chains, and furlongs are often used to describe the volume of the reservoirs.  Give your class a little practice and appreciation of the…Read more →
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10:03 AM | Maths in Science - Andrew Knoll
Professor Andrew Knoll is one of the world's leading paleontologists and works at Harvard University. He has numerous awards and achievements to his credit including Paleontological Society Medal, the Wollaston Medal of the Geological Society (London), the Moore Medal of the Society for Sedimentary Geology, the Oparin Medal of the International Society for the Study of the Origin of Life, and both the Walcott and Thompson medals of the US National Academy of Sciences.  Professor Knoll […]
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9:20 AM | Last Revision Lessons
Study leave is approaching fast for our examination classes so it’s time to think about those last lessons. I will be using a few mental tests with all my examination students as I find these work very well indeed. Last … Continue reading →
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8:48 AM | Venn Diagrams - Students Survey
Students complete a simple survey. As a class, the responses are recorded onto a Venn Diagram and tallied in the table.
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