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Posts

June 30, 2015

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9:06 PM | Space Rocks
via michaelshillingburg
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8:55 PM | My Pie
This is more for me than you, but also a nice reminder to everyone that if I don’t update this site for a while, it’s “because book.” This pie chart will be a sticky post until I’m finished writing. (it’s here for a while)  
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8:54 PM | Unizor - Geometry3D - Prisms - Parallelepiped
Unizor - Creative Minds through Art of Mathematics - Math4TeensAn introduction to prisms was presented in the chapter "Elements of Solid Geometry" of this course (see topics "Cylindrical Surface" and "Prisms"). We recommend to refresh this information prior to continue with properties and characteristics of prisms presented in this lecture.Parallelepiped is a prism with a parallelogram as its directrix.Arguably, parallelepiped is the most frequently occurring type of prisms, especially, if it's […]
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8:14 PM | Paul Ernest on Douglas Quadling
[See also: Douglas Quadling] In 1979 I joined the staff at Homerton College, Cambridge as a temporary replacement for Stuart Plunkett on study leave. This was my first job after school teaching as a teacher educator. I worked alongside Richard … Continue reading →
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8:09 PM | geometricloci: Parametric curves
geometricloci: Parametric curves
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8:05 PM | 7 Days of Maths: MathsSandpit.co.uk #2
Calculator Skills. It’s very hard to find a decent resource to help teach how to use a calculator. There are few around, and fewer that inspire me to teach the topic enthusiastically . I love this resource because it ticks all the boxes. Inspired, simple and different.
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7:46 PM | Πόσο μπορεί να επηρεάσει το νόμισμα;
     Δύο φίλοι, ο Β και ο S, παίζουν ένα παιχνίδι με κέρματα. Ο κάθε ένας από τους δύο έχει τα δικά του κέρματα. Ο κάθε ένας από τους δύο ρίχνει όλα τα κέρματά του (μια φορά) και κερδίζει όποιος έφερε τις περισσότερες κορώνες. Ο Β πιστεύει ότι έχοντας περισσότερα κέρματα στα […]
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6:31 PM | Virial expansion for a gas
Reference: Daniel V. Schroeder, An Introduction to Thermal Physics, (Addison-Wesley, 2000) – Problem 1.17. The ideal gas law isn’t entirely accurate for any real gas. For low density gases, one way of accounting for deviations from the ideal gas law is to use a virial expansion: where and are the virial coefficients, and depend on […]
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6:29 PM | Number of the Day: 1
Today's number, 1, comes courtesy of the leap second.
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6:04 PM | Mark Thoma continues to shine
Nobody talks about the assumptions behind free markets better than Mark Thoma, who has a new piece on the subject.  It really should be required reading, because it sets the pattern of regulations that all society's develop in context and makes it hard to have an absolutist view on a lot of subjects. At the same time, it appropriately acknowledges just how powerful this process can be when the necessary preconditions exist.
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6:00 PM | Empty bins
Suppose that  balls,  where is a constant, are thrown sequentially to bins, all of which are initially empty. Let be the number of empty bins after we have thrown balls. Clearly, . Let’s see how we can understand this sequence of random variables. … Continue reading →
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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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5:13 PM | Οδυσσέας Ελύτης – Θέση της Ελλάδας στην Ευρώπη
No summary available for this post.
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5:09 PM | What it means to be a part of a learning community - Tribal Elder Edition
One interesting moment from the Oregon Math Network Conference this past week:Bill McCallum was leading a large-ish session on building a culture of collaboration through jointly investigating student work.Fawn (@fawnpnguyen) and I were sitting side by side at a table off to the side, each of us prepping madly for our next sessions. But neither of us could resist the lure of student work. We set our own presentations aside and pulled up the examples of middle school student work on Fawn's […]
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5:00 PM | Unlearning mathematics
I was reading the comment thread in an old post of mine when I hit this gem by Bert Speelpenning: Here is a short list of things that kids in math class routinely unlearn in their journey from K through 12: * when you add something, it gets bigger * when you see the symbol […]
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4:52 PM | Balloon, art and mathematics
After (or before?) @StartsWithABang's balloon animals' post? A couple of week ago Ethan Siegel published a post about ballon animals, so I decide to repost an old piece that I wrote in 2011 for my italian blog: the english version is lost, but it is magically reposted here! Two one-balloon constructions and their associated graphsI recently discovered this interesting site, vihart. In the site there are some interesting paper and today I want to write something about Computational Balloon […]
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4:45 PM | Mathematics in Photos #10
No summary available for this post.
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4:42 PM | Barometric equation: the exponential atmosphere
Reference: Daniel V. Schroeder, An Introduction to Thermal Physics, (Addison-Wesley, 2000) – Problem 1.16. A model for the pressure in the atmosphere as a function of height can be estimated from the ideal gas law. Suppose we have a horizontal slab of air with thickness and a unit cross sectional area. The density of air […]
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4:38 PM | The New GCSE #7 Non-Calc Side by Side
Ok, these are the new specimen papers (the last ones have been thrown out essentially!) Each page is side by side for the 3 exam boards (there’s a fourth exam board, but they have 2 longer papers so the comparison is a bit more difficult, so i’ve omitted them). On hand is Michael Gove to … Continue reading →
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4:24 PM | El éxito de GameLab en el Desarrollo de Juegos de Simulación de Procesos y Negocios
GameLab, y su lema: from Classroom to playground (de la sala de clases al patio de juegos) constituye un excelente resumen de la orientación de esta empresa tecnológica fundada en Chile dedicada al desarrollo de juegos de simulación para cursos y universidades. El objetivo de sus distintos juegos es crear una experiencia inolvidable para los […]
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4:03 PM | Do not let the students do the LEAST they can...
At some point next year a slew of high school students will be learning about ellipses. I hope that they get to learn and explore using GeoGebra at a minimum. Whether it is used as a presentation device or a lab tool, it would be helpful.Limiting student technology to a graphing calculator is, well, limiting. the entire file for this can be found at http://tube.geogebra.org/material/show/id/1379965
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3:39 PM | Combining Inside Out emotions for new ones
Spoiler alert for Inside Out. At the climax of the movie, we see that emotions can combine for deeper, more complex feelings, and it's these combinations that get Riley through…Tags: emotion, Inside Out
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3:30 PM | “Values were outside expected ranges”: Toxicology paper spiked after audit
Researchers at the National Institute of Environmental Health Sciences have retracted a 2014 article after a review unearthed unresolved problems with the study’s control material. The retracted paper, “Effect of Temperature and Storage Time on Sorbitol Dehydrogenase Activity in Sprague-Dawley Rat Serum and Plasma,” looked to test the durability and stability of sorbitol dehydrogenase, an […] The post “Values were outside expected ranges”: Toxicology paper spiked after […]
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3:29 PM | Teachers: At what are you an expert?
This is the second in a series of reflections that came out of a fantastic sit-down with #MichED -ucators Melody Arabo (@melodyarabo) and Jeremy Tuller (@jertuller). Melody asked a question that followed up by mentioning that teachers have a really, really hard time answering: What parts of your professional work would you consider yourself to […]
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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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3:02 PM | The heavy ball method as “perturbed gradient method”
</a I am at at IFIP TC7 and today I talked about the inertial primal-dual forward-backward method Tom Pock and I developed in this paper (find my slides > here). I got a few interesting questions and one was about the heavy-ball method. I used the heavy-ball method by Polyak as a motivation for the […]
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3:00 PM | Relations & Their Relatives : 11
Re: Peirce List Discussion • Jeffrey Brian Downard In discussing the “combinatorial explosion” of dyadic relations that takes off already in passing from a universe of two elements to a universe of three elements, I made the following observation: Looking … Continue reading →
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3:00 PM | No Frills Notebooks
Last year I rattled through some frequently asked questions.People point to me as a user of interactive notebooks. I would not call my notebooks interactive in the same category as what the internet considers an interactive notebook. If you're looking for foldables, tables of contents, and scripted notebook pages, please go check out Sarah Hagan. She even had a whole day celebrating her.Anyway, this is what I do to get students to do stuff. Time for bullet points!GalleryHere's some pictures. […]
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2:50 PM | Why wait a second?
Why today is 24 hours and 1 second long. Rejoice! Today, June 30th 2015, will be one second longer than other days. The extra leap second was announced a few months ago by the impressively-named International Earth Rotation and Reference Systems Service. But why do we need it?read more
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2:37 PM | IsarMathLib 1.9.3 released
This is a maintenance release to update IsarMathLib for Isabelle2015. There is no new formalized mathematics in this release.
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