X

Sidebar

Filters

+

Last week was was a strange week of firsts for Math in Your Feet. I've been a teaching artist for about sixteen years and started exploring the connections between math and percussive dance in late 2003. Between 2004 and 2006 the program was piloted twice at all nine elementary schools in a large urban school district in Indianapolis, IN; prior to that I spent five years teaching clogging at many, many small, often isolated, rural schools across North Carolina, South Carolina and
[…]

+

A little over a year ago, I wrote up my Leapfrog Division post. It's about time for a modification!
The original technique showed you how to work out the decimal equivalent for fractions whose denominators end in 9. In today's post, you'll learn a similar technique for denominators ending in 1.
Before learning this technique, you do want to be very comfortable working with the original Leapfrog

+

A method for making large amounts of the wonder material graphene is so simple that it can be done with kitchen appliances and Fairy Liquid

+

I need a slight generalization of a classic result on algebraic theories. You may know who proved it!

+

(Click on the cartoon to see the full image.) (C)Copyright 2014, C. Burke.That's only for fresh eggs. It's okay to put hard-boiled eggs in one basket because you want them all to break so you have an excuse to throw them all out! Seriously, I know some people who eat them, but I know few who enjoy them.

matthewmaddux posted Data Doesn’t Lie? The Fuzzy Math Behind the Search for MH370 on MatthewMaddux Education

Data Doesn’t Lie? The Fuzzy Math Behind the Search for MH370: Jeff Wise:
The March 25 report stated that Inmarsat had used a new kind of mathematical analysis to rule out a northern route. Without being very precise in its description, it implied that the analysis might have depended on a small but telling wobble of the Inmarsat satellite’s orbit. Accompanying the written report was an appendix, called Annex I, that consisted of three diagrams, the second of which was titled “MH370
[…]

2014-04-20 18:45:24

BIRTHDAY CHALLENGE: Try creating a tetrahedron-like structure (regular triangular pyramid) with 20 balls or spheres. Today’s the 20th of April and the birthday of an Evertonian – which explains the image of […]

2014-04-20 14:59:50

2014-04-20 13:05:15

rlgordonma posted Generalizing an already tough integral on Math math math math baked beans and math

I did the case $p=1$ here. The generalization to higher $p$ may involve higher-order derivatives as follows: $$\begin{align}K_p &= \int_0^{\pi/2} dx \frac{x^{2 p}}{1+\cos^2{x}} = \frac1{2^{4 p-1}} \int_{-\pi}^{\pi} dy \frac{y^{2 p}}{3+\cos{y}} \end{align}$$ So define, as before, $$J(a) = \int_{-\pi}^{\pi} dy \frac{e^{i a y}}{3+\cos{y}} $$ Then $$K_p = \frac{(-1)^p}{2^{4 p-1}} \left [\frac{d^{2 p}}{da^{2 p}} J(a) \right ]_{a=0}$$ […]

2014-04-20 01:20:32

료칸 미키야에서 체크인을 끝내고 밖으로 나와 봤습니다. 외양 온천 메구리를 즐기기 전에 일단 마을의 이곳저곳을 좀 돌아다녀 보기 위해서… 역시 평상복을 입고 돌아다니는 사람들보다 유카타를 걸치고 있는 사람들이 훨씬 많았습니다. 유카타를 보면 머물고 있는 료칸이 어딘지도 알 수 있죠! 7개의 … Continue reading →Related Posts ?[교토 쿠라마 여행 05] 쿠라마 온천
[…]

2014-04-19 21:42:47

Here the monotonicity of the EM algorithm is established. $$ f_{o}(Y_{o}|\theta)=f_{o,m}(Y_{o},Y_{m}|\theta)/f_{m|o}(Y_{m}|Y_{o},\theta)$$ $$ \log L_{o}(\theta)=\log L_{o,m}(\theta)-\log f_{m|o}(Y_{m}|Y_{o},\theta) \label{eq:loglikelihood} $$ where \( L_{o}(\theta)\) is the likelihood under the observed data and \(L_{o,m}(\theta)\) is the likelihood under the complete data. Taking the expectation of the second line with respect to the conditional distribution of
[…]

2014-04-19 20:25:41

by @ulaulaman about #exoplanets #planetary_transit #kepler_mission #nasa #astronomy The search for extrasolar planets (or exoplanets) had its first success in 1991 with the discovery of some planets orbiting around the pulsar PSR1257+12(1, 2, 3), measuring the variations of the radio pulses coming from the star. The second important milestone in exoplanet research takes place in 1995, with the discovery around the star 51 Pegasi (a star like our Sun) of a Jupiter-like planet, found at a […]

2014-04-19 19:48:00

matthewmaddux posted How I Slayed The Mathematical Beast-Monster by Karla Gabruch on MatthewMaddux Education

Egan…Each semester, on the last day of class, I make prospective elementary school mathematics teachers hand in a Duo-Tang, which contains their weekly math homework and their weekly discussion points (one page responses based on required readings from our text). Ultimately, the Duo-Tang assignment is an ongoing collection of “work” intended to capture prospective elementary school math teachers’ thinking with respect to mathematics and mathematics education over the
[…]

2014-04-19 16:08:00

X