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Posts

November 24, 2014

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8:33 AM | Un reto tricolor
No te mates, que no hay manera le decían los otros dos alumnos a su compañero. Habían venido a resolver unas dudas y, cuando ya se iban, uno preguntó cuándo aparecería otro reto en el blog. Es que tengo un amigo al que siempre se los cuento, dijo. No me pude resistir. Y ahí seguía, un buen rato después, intentando evitar triángulos tricolores. (Sigue leyendo...)
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8:15 AM | La magia de la tabla Periódica [Tito Eliatron Dixit]
Mi primera aportación a CarnaMat58 es este anuncio de conferencia: La magia de la Tabla Periódica [Conferencia]

November 23, 2014

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10:56 AM | divisibility of ideals
newest definition
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10:40 AM | principal ideal ring
newest definition
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10:31 AM | principal ideal
newest definition
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10:07 AM | ideal
newest definition
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9:21 AM | ideals
updated section
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12:55 AM | Slice the Pie
This simple fraction game has students estimation the portion of a circle shown by the given fraction. It then rewards them for their accuracy.

November 22, 2014

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11:29 PM | Problem of the week the spider and the fly.
A worksheet to accompany the problem shown on The Curiosity Show (link below).
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8:10 PM | The 1492 Challenge
By using each digit from 1492 exactly once, how high can you build the positive integers?
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8:05 PM | What is the Pizza Theorem?
Are you being cheated on pizza?
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7:58 PM | The Simplest Impossible Problem
A 7-year-old can understand this problem which completely baffles mathematicians.
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6:57 AM | What is a vector? (TANTON Mathematics)
People say that a vector is "a quantity with both magnitude and direction." What does that mean?  This approach to vectors is too confusing. In this brief introduction allow me to demonstrate a more natural - and meaningful - approach to vectors. They're easy - and don't need to be made confusing.
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1:04 AM | We Use Math - Introduction
When will I use this? Meet professionals from a number of exciting fields who use mathematics in their jobs every day.
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12:39 AM | GNU XaoS fast interactive fractal zoomer
XaoS is an interactive fractalzoomer. It allows the user to continuously zoom in or out of a fractal in a fluid, continuous motion. This capability makes XaoS great for exploring fractals, and it’s fun! Fractal zoomers on the iPad tend not to be free. This software is for Mac, Windows, Linux and is free. There is also a simplified online version.
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12:21 AM | Visually stunning math concepts which are easy to explain
There are some great visualisations of mathematical concepts all over the net. This is a nice collection.

November 21, 2014

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2:30 PM | Doing what we think is the minimum necessary is more difficult that being fully committed
A couple of years ago, I committed to giving a series of lectures (a sort of mini-course) on measure theory at the Universidad de El Salvador. Not a big deal except for two challenges. (1) Teaching at a primarily undergraduate … Continue reading →
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11:27 AM | Multiplying with a Parabola!
This could form an interesting investigation for students studing the parabola. How can you use a parabola to multiply two numbers? Find out how. The YouTube description includes an online demonstration (Desmos) and there is a GeoGebra version.
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7:53 AM | Spider and Fly Puzzle
The shortest route for a spider to reach a fly seems obvious in this rectangular room, but Rob shows that it might be trickier than it seems.

November 19, 2014

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9:57 PM | points on a line inside and outside a circle
newest proposition
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9:50 PM | bisected chord of a circle passes the center
newest corollary
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6:20 AM | Venn Diagram Interactive
Interactive to explore venn diagrams. Drag the numbers into the appropriate circle.

November 18, 2014

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10:29 AM | Art of Problem Solving
Art of Problem Solving {webinar_buttons.png} Enter the webinar room Ethnomathematics-RecordingMangahigh-RecordingRecording Full recording (text, voice, video)

November 16, 2014

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4:40 PM | La eclíptica y el zodíaco
La eclítica y el zodíaco, la nueva píldora de matemáticas donde mostramos como la invención del zodíaco griego se hizo en base a la eclíptica del Sol.

November 14, 2014

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4:27 AM | Trigonometry & Logarithms - Marcus Du Sautoy
Marcus Du Sautoy explains a connection between Logarithms and Primes, and explains the connection between digital sound and Trigonometry.
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4:20 AM | Integration & Differentiation - Marcus Du Sautoy
A ~3 min summary about integration and differentiation by well known mathematics presenter Marcus Du Sautoy.
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