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11:00 PM | On This Day in Math - October 26

There are no foolish questions and no man becomes a fool until he has stopped asking questions. Charles P SteinmetzThe 299th day of the year; If a cubic cake was cut with 12 straight cuts, it can produce a maximum of 299 pieces.... a good day to "let 'em eat cake."EVENTS1676 Newton, through the intermediary of Oldenburg, wrote Leibniz concerning his work on the calculus. An anagram contained the statement of the problem of integrating differential equations. *VFR 1738 Theophilus Grew, […]

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10:42 PM | Dividing with fractions, using pennies

Yesterday, I was going to use the height of a penny in a math question on a quiz so I googled "width of a penny". It said it was 3/4 inch. That wasn't what I wanted, but I liked the number. I went to bed thinking about it and woke up with this....Maybe an actual original idea for the #MTBoS?There has been recent discussion on blogs and twitter about how to teach dividing by fractions besides just telling the kids to multiply by the reciprocal - the why part.It got me to […]

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10:14 PM | marauders of the lost sciences

The editors of a new blog entitled Marauders of the Lost Sciences (Learn from the giants) sent me an email to signal the start of this blog with a short excerpt from a giant in maths or stats posted every day: There is a new blog I wanted to tell you about which excerpts one […]

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8:47 PM | When to buy airplane tickets

From Yahoo Travel: what day of the week to buy airplane tickets for the best deal. Short version: round trip domestic airfares average about $430 on weekends and about $500 on weekdays, so buy on the weekend. The Yahoo piece is, in turn, a condensation of this piece from the Wall Street Journal. The WSJ […]

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The prime number theorem can be expressed as the assertion as , where is the von Mangoldt function. It is a basic result in analytic number theory, but requires a bit of effort to prove. One “elementary” proof of this theorem proceeds through the Selberg symmetry formula where the second von Mangoldt function is defined […]

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6:11 PM | Three films

Sometimes, in the course of researching a post, a link leads to a completely unexpected corner of the internet. In this case, a post on Mark Evanier lead here.The first is a cameraless film with hand-drawn sound from before the war, the second explains the technique and the third stands alone.Norman McLaren - Dots (1940)

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5:07 PM | 5 Maths Gems #11

I've got some brilliant gems for you this week. As usual Twitter has been on top form.
1. Quick Key
Last week I wrote about Plickers, which is an app you can use in the classoom for formative assessment - you need a device but your students don't. Today I'm suggesting another app that you can use for assessment - Quick Key. With this app you can set multiple choice homeworks or tests and mark

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A couple of months ago I made a video about Lorenz: Hitler’s “unbreakable” cipher machine.
That video was filmed by Ben Roper who is a proper filmmaker - that’s why it looked so much better than the videos I usually make!
Ben gave up his own time help us make that video, so if you like it then you should know that Ben has started a kickstarter to make a short film about love between two washing machines
If you want to support Ben and the film please donate. And maybe
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4:41 PM | 3 YEARS AGO: MONTHLY MEMORY LANE

MONTHLY MEMORY LANE: 3 years ago: October 2011 (I mark in red 3 posts that seem most apt for general background on key issues in this blog*) (10/3) Part 2 Prionvac: The Will to Understand Power (10/4) Part 3 Prionvac: How the Reformers Should Have done Their Job (10/5) Formaldehyde Hearing: How to Tell the Truth With Statistically Insignificant Results (10/7) Blogging […]

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The EU has demanded rapid payment of £1.7 billion from the UK because our economy has done better than predicted, and some of this is due to the prostitution market now being considered as part of our National Accounts and contributing an extra £5.3 billion to GDP at 2009 prices, which is 0.35% of GDP, half that of agriculture. But is this a reasonable estimate?

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3:21 PM | I have learned …

Students aren’t kidding when they ask, “When will we ever need to know this?” In How the Brain Learns Mathematics, David Sousa suggests that students need a reason to move information from short-term memory to long-term memory. What opportunity do we give our students to reflect on what they are learning and why during class? […]

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3:00 PM | The First 100 Prime Numbers

The First 100 Prime Numbers An integer n is a prime number if it has no divisors (except for 1 and itself). Another way to say this is that a set of n objects cannot be broken into pieces of equal size. Or you could say that the equation n=a*b can never be true, where a and b are integers. Beginners sometimes get confused by the term "divisor". When mathematicians say that one integer divides another integer they mean with no remainder. Prime numbers are fundamental numbers because.. Any
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The bee-bot programmable robot teaches logic, the basics of programming and how a computer "thinks."

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“Profit Doubles at G.M., as It Strives to Move Past Its Litany of Recalls”: General Motors’ quarterly earnings report on Thursday was noteworthy mostly for what it lacked: another big financial charge for safety recalls. After running up special charges of nearly $3 billion in the first half of the year for safety problems, G.M., […]

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Here at the Rotman conference on Climate Science, Paul Edwards is talking about "knowledge infrastructures" and how the production of knowledge has radically changed over the last 20 years from a much more individualistic enterprise, with pyramids of expertise, peer review, etc to a much more distributed model. He mentioned...

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[sorry if this isn't edited well, limited editing time due to lots of kid activities today] Saw this post on twitter earlier in the week: It made for a great follow up to a previous Family Math which also happened … Continue reading →

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1:32 PM | Modeling Systems

Sort of a rambling post. But trying to make some sense of my thinking… I always appreciate posts from @emergentmath. This particular post made me pause, I had just completed the MARS task, Boomerangs, he references. We are in the midst of our systems unit. I used Mary & Alex ‘ s suggestions with beginning […]

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The week at Retraction Watch began with the retraction of a paper touted by Dr. Oz. Here’s what was happening elsewhere: “How to Make More Published Research True:” John Ioannidis strikes again. Did you know that Shakespeare wrote about peer review? A leading vision researcher has decided to finally do a post-doc — at the […]

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1:27 PM | DummyTTP

DummyTTP is a protocol which can be used to replace HTTP for certain purposes. Don’t worry: no changes to client software are necessary. This is not a difficult proposal requiring committee agreements or consortium meetings. This protocol is subversive, it runs underneath the surface on server-side, invisible to the very browser programmers themselves. Overview In [...]

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See this recent post for background. Here’s the question: It is sometimes said that the p-value is uniformly distributed if the null hypothesis is true. Give two different reasons why this statement is not in general true. The problem is with real examples, not just toy examples, so your reasons should not involve degenerate situations such as […]
The post Solution to the problem on the distribution of p-values appeared first on Statistical Modeling, Causal Inference, and Social
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Panorama from Point Sublime [Grand Canyon] – Printed by Julius Bien [1882] If you want to know about Protoliths, Abyssoliths, Xenoliths and Tectonic Knots, of index fossils, totemic assemblages of ophiolitic Serpentine, of erratic stones and aesthonspheric calligraphy, geochronology, abyssal plains and gravity maps, you might do well to journey with John Mcphee over the […]

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Reference: Moore, Thomas A., A General Relativity Workbook, University Science Books (2013) – Chapter 21, Problem 21.9. The Einstein equation is Up to now, we’ve usually taken , since we know from the Newtonian limit that must be very small. If , the Newtonian limit becomes so acts as a negative mass density, that is, […]

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12:30 PM | 10/25/14

10 / 2 = 5 * 1^4
Also:
10 - 2 - 5 = |1 - 4|
Also:
10 / (2 * 5) = 1^4
Also:
102 (mod 5) = 1 * √4

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12:27 PM | On Two Against One - student

Recall that in the Baron's latest game, for a cost of one coin, Sir R----- could roll two dice and have from the Baron coins equal in number to the best of them. In return, the Baron would have from Sir R----- coins equal to the roll of a solitary die.

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12:23 PM | Exploring Rates – Part Two

One of the primary goals this year is to find opportunities to use rates in a more practical setting. This past week my classes started to explore rates in more detail. Students studied visual patterns and rules last week and this has led up to using/converting rates with formulas. While planning I dug out a […]

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11:43 AM | Aunt Pythia’s advice

You guys know how much Aunt Pythia loves you, right (answer: a ton)? OK, good. Because that means I can be honest with you. The truth is, I’ve been getting some very weird questions recently, and I’ve had to throw out a bunch of them, sifting through the weeds to find some tulips. It’s not […]

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11:17 AM | Making a ghost costume

I’m going to make a costume pattern to sell. People can buy my plan and make awesome, long, full, scary, ghost costumes. This scheme will be so simple. Perhaps I’ll get rich! In this activity young students can reason about…Read more →

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Winifred Edgerton Merrill fu la prima americana ad ottenere un dottorato in matematica presso la Columbia University nel 1886. Nella sua tesi sviluppò una rappresentazione geometrica degli infinitesimi in diversi sistemi di coordinate, utilizzando lo jacobiano per per derivare le trasformazioni tra gli integrali nei diversi sistemi.Tra matematica e astronomiaNata a Ripon, nel Wisconsin, il 24 settembre del 1862 da Emmet e Clara Edgerton, si trasferisce con la famiglia a New York intorno al […]

Kelly S.E. & Rozner S.A. (2012). Winifred Edgerton Merrill: "She Opened the Door", Notices of the American Mathematical Society, 59 (04) 504-512. DOI: http://dx.doi.org/10.1090/noti818

Citation

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Winifred Edgerton Merrill fu la prima americana ad ottenere un dottorato in matematica presso la Columbia University nel 1886. Nella sua tesi sviluppò una rappresentazione geometrica degli infinitesimi in diversi sistemi di coordinate, utilizzando lo jacobiano per per derivare le trasformazioni tra gli integrali nei diversi sistemi.Tra matematica e astronomiaNata a Ripon, nel Wisconsin, il 24 settembre del 1862 da Emmet e Clara Edgerton, si trasferisce con la famiglia a New York intorno al […]

Kelly S.E. & Rozner S.A. (2012). Winifred Edgerton Merrill: "She Opened the Door", Notices of the American Mathematical Society, 59 (04) 504-512. DOI: http://dx.doi.org/10.1090/noti818

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Direi che oggi pomeriggio è stato un bel respirare, al Palazzo Brera. Cristina Lazzeroni dell'Università di Birmingham è venuta alle 18 (come avevo scritto nel post precedente) per raccontare del bosone di Higgs, del modello standard e di materia e antimateria. E' una sperimentale presso l'esperimento LHCb al CERN, l'esperimento dedicato proprio alla ricerca su uno dei grandi misteri dell'universo: perché in esso c'è un eccesso di materia (e d'altra parte se non fosse così, non ci sarebbe […]

Aaij R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander & S. Ali & (2013). First Observation of CP Violation in the Decays of B_{s}^{0} Mesons, Physical Review Letters, 110 (22) DOI: http://dx.doi.org/10.1103/physrevlett.110.221601

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Per i I cieli di Brera, il 24 settembre (domani... scusate per il ritardo nell'annuncio...) alle 18 presso la Sala delle Adunanze dell'Istituto Lombardo nel Palazzo Brera sito in via Brera 28 (Milano), si terrà la conferenza La fisica delle particelle e il Large Hadron Collider: recenti sviluppi e questioni aperte: Cristina Lazzeroni ci introdurrà alla fisica delle particelle e agli studi fatti al Large Hadron Collider del Cern di Ginevra mettendo l’accento su recenti sviluppi come la
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Aad G., J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, S. H. Abidi, M. Abolins, O. S. AbouZeid & H. Abramowicz & (2014). Measurement of the Higgs boson mass from the $H\to \gamma \gamma $ and $H\to Z{Z}^{*}\to 4\ell $ channels in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector, Physical Review D, 90 (5) DOI: http://dx.doi.org/10.1103/physrevd.90.052004

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One of the exciting things about mathematical oncology is that thinking about cancer often forces me to leave my comfortable arm-chair and look at some actually data. No matter how much I advocate for the merits of heuristic modeling, when it comes to cancer, data-agnostic models take second stage to data-rich modeling. This close relationship […]

Gallaher, J. & Anderson, A.R. (2013). Evolution of intratumoral phenotypic heterogeneity: the role of trait inheritance., Interface Focus, 3 (4) 20130016. arXiv: 1305.0524v1

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mathfour tweeted: @mathfour

Bee-Bot Floor Robot – Teaching Basic Programming #mathchat http://t.co/tBBEi9Rbuc

2014-10-26 07:14:17

freakonometrics tweeted: @freakonometrics

"In Texas, It's Easier to Buy an Assault Weapon Than to Vote" http://t.co/AvHIO8PMsK ht @fdastous

2014-10-26 07:13:47

freakonometrics tweeted: @freakonometrics

"Aidez le CERN avec ses photos mystères" http://t.co/fPcoLupivb "1947 : Invention du suppositoire" (par @grommeleur) http://t.co/CmeXGPWF3K

2014-10-26 07:04:47

freakonometrics tweeted: @freakonometrics

"Université : pourquoi la sélection peut être une solution" http://t.co/S20HdPWEaA

2014-10-26 06:56:53

freakonometrics tweeted: @freakonometrics

"Connecting music and art via mathematics" http://t.co/QPAM4UqSoh (see http://t.co/T1RgIS84XN) http://t.co/4K1t10ASpy

2014-10-26 06:47:52

freakonometrics tweeted: @freakonometrics

Nice (by @flipflopflying) "Different Band Members and Where They Stand on Stage" http://t.co/Un2GhR5M0B

2014-10-26 06:42:49

freakonometrics tweeted: @freakonometrics

Twitter Followers-Following Patterns (capped at 1000) by @rcweir http://t.co/iEF3AL7Aou

2014-10-26 06:40:15

freakonometrics tweeted: @freakonometrics

"Geodemographics of Londoners" http://t.co/nTfwZweZwS via http://t.co/jvI6MqSLbP http://t.co/1pWU9uw7tP

2014-10-26 06:36:16

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