A Recursive Process | A Recursive Process

Bedouins Breaking Bread

May 17, 2014, 12:00 am

From cartalk…

How did the magistrate recommend that the two bedouins divide the money?

Money Duck

May 11, 2014, 12:00 am

This is a crosspost from my 180 photo blog.

Introduction

If you haven’t read Dan Meyer’s take on the Money Duck, go ahead and read up.

Here’s some classroom action:

Act 1

I presented the Money Duck to my PreCalculus H classes. We were in the midst of probability and we were moving to...

Edward Frenkel on Math and Beauty

April 9, 2014, 12:00 am

Edward Frenkel, author of Love and Math, was on The Colbert Report.
Here’s a transcript of an especially interesting segment:

Edward Frenkel: When you say that you hate math, you’re really saying I hate the way math was taught to me. Imagine you’re in art class in which they only teach yo...

I had so much fun with the original Mandelbrot program that I decided to see if I could improve it. I was amazed by how easily I was able to generate a fractal picture that looked exactly like other pictures online. I didn’t look at anyone else’s code, just went down the path and the amazing Mande...

Mandelbrot Fractal

March 27, 2014, 12:00 am

I was inspired by a My Favorite presentation from a student on the Mandelbrot fractal. I played around for a half hour at school without a ton of success, but I sorted out the sticking points on the way home, and finished it up tonight. Amazingly simple (the code may not look simple, but it’s all...

Chaos Game v2

March 19, 2014, 12:00 am

I prepared a small demonstration of the Chaos game for some math teachers. First we used transparencies, markers, dice, and rulers, but humans are mistake-prone and slow.

To The Computer!

I decided to experiment with the rules of the game to see where it’d go.

Human Error

What happens wh...

Buffon’s Needles simulation in Processing

March 14, 2014, 12:00 am

Buffon’s Needle is a famous way to (slowly) estimate $\pi$ .
Here’s a processing.org program to calculate $\tau$ (to keep the math-hipster hatred of $\pi$ -day at a critical point and concave up).

Link to live simulation and code. All variables are easy to change, size of window, length of needle, spacin...

Power Series on Desmos

March 5, 2014, 12:00 am

This is a crosspost from my Photo 180 blog.

Power Series work in AP Calculus BC.

$\sum_{n=0}^{\infty}(-1)^{n}\frac{x^{2n+1}}{(2n+1)!}=\frac{x}{1!}-\frac{x^3}{3!}+\frac{x^5}{5!}-...$

Process: Since it’s a infinite series, look at partial sums to get an idea what this graph looks like.
So look at
$y_1=\frac{x}{1!}$
$y_2=\frac{x}{1!}-\frac{x^3}{3!}$
$y_2=\frac{x}{1!}-\frac{x^3}{3!}+\frac{x^5}{5!}$
…
Perfect time to use technology.

Texas Instruments Method

Go to y1. Enter in $y=x$ .
Gra...

Brian Greene’s take on teachers.

February 5, 2014, 12:00 am

My best teachers were not the ones who knew all the answers, but those who were deeply excited by questions they couldn’t answer.

— Brian Greene (@bgreene) February 5, 2014

Fantastic.

Two James Tanton Questions

January 28, 2014, 12:00 am

It’s midterm week at school, and James Tanton threw out two interesting questions in two days. I spent a little time programming “solutions” to these problems (not solutions, just verifications for an infinitesimally small portion of the natural numbers).

Problem One:

Start with a prime, s...