The Man Who Knew Infinity (Mathematical Movie!)

Hi! For this post, I thought I would take a break from posting math riddles and take a brief moment to draw your attention to an exciting new movie premiering in the United States this week – “The Man Who Knew Infinity”, a biography of Srinivasa Ramanujan directed by Matthew Brown, based on the book of the same name by Robert Kanigel. Starring some serious screen talent – including Dev Patel and Jeremy Irons – “The Man Who Knew Infinity” chronicles Ramanujan’s life and mathematical talents, mainly focusing on his time spent in Cambridge and his relationship with his mentor, G. H. Hardy. I had the good fortune to be able to attend an advance showing of the movie with several other graduate students, and it was a great experience. Read on for more details!

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Dance Your Dissertation: Behind the Scenes

Three years ago, our former editor Diana Davis created the following math youtube sensation, conveying the main ideas of her geometry dissertation to the general public through dance, music, and some highly-skillful video editing. Today, we unlock the magic behind it.  First, watch the video if you haven’t seen it:

And now, an exclusive behind the scenes interview with Diana Davis about how she put this incredible project together without any prior experience:

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Traversing Mountain Passes

Puddles

How can you (mathematically) avoid walking in deep puddles? Photo by Alexi Hoeft, used with permission.

Suppose you need to walk through a wet parking lot. The lot is covered with puddles and you would like to keep your shoes as dry as possible. If you know the depth of the puddles at every point, how do you choose the path that minimizes the maximum depth of the puddles you cross? A hiker might want to solve a similar problem if they want to avoid fatigue by seeking low elevations. How do you traverse a mountainous area while remaining as low as possible?

To make the problem more formal, say the area of interest is X=[0,1]\times[0,1] and the elevation of the ground (or puddle depth) at each point (x,y) \in X is f(x,y), with f:X\to\mathbb{R} continuous. Choose areas that are acceptable start and finish points and call them X_0 and X_1. If you want to walk from the north end of the square to the south, then you could choose X_0=[0,1]\times\{1\} and X_1=[0,1]\times\{0\}. The problem can be stated as Continue reading

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For sale: Baby shoes. Never worn.

As the perhaps apocryphal story goes, the title of this piece is a six-word novel written by Ernest Hemingway as part of a bet while at lunch with a group of writers. The idea behind the six-word story, also commonly know as flash fiction, is, well, to tell a story in six words or less. A quick googling reveals thousands of such stories ranging from the rather dark:

Ernest Hemingway in 1939. Public domain photo, Wikimedia Commons.

Ernest Hemingway in 1939. Public domain photo, Wikimedia Commons.

“Goodbye, mission control. Thanks for trying.” ~aiken_~

to the lighter

“I leave. Dog panics. Furniture shopping.” ~Reed~

That said, there seem to be very few–I found two or three–flash fiction stories pertaining to math. With this in mind I want to propose a challenge:

Write your own six-word story/stories capturing the life, experiences, or work of mathematicians and graduate students, and post them in the comments below. The best ones will be highlighted in my post next month!

To give some sense of what I mean, and maybe to help get your creative thoughts rolling, here are two six-word stories I wrote about common experiences in the lives of math graduate students.

Working hard, checked arXiv. Start again.

From: Grad Admissions. “We are sorry…

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3 Revolutionary Women of Mathematics

Credit: PhotoDune

Credit: PhotoDune

Originally published by Scientific American 

From the profound revelations of the shape of space to the furthest explorations reachable by imagination and logic, the history of mathematics has always been seen as a masculine endeavor. Names like Gauss, Euler, Riemann, Poincare, Erdös, and the more modern Wiles, Tao, Perelman, and Zhang, all of them associated with the most beautiful mathematics discovered since the dawn of humanity, are all men. The book Men of Mathematics, written by E.T. Bell in 1937, is just one example of how this “fact” has been reinforced in in the public consciousness.

Even today, it is no secret that male mathematicians still dominate the field. But this should not distract us from the revolutionary contributions women have made. We have notable women to thank for modern computation, revelations on the geometry of space, cornerstones of abstract algebra, and major advances in decision theory, number theory, and celestial mechanics that continue to provide crucial breakthroughs in applied areas like cryptography, computer science, and physics.

The works of geniuses like Julia Robinson on Hilbert’s Tenth Problem in number theory, Emmy Noether in abstract algebra and physics, and Ada Lovelace in computer science, are just three examples of women whose contributions have been absolutely essential.

Julia Robinson (1919-1985)

At the turn of the twentieth century the famed German mathematician David Hilbert published a set of twenty-three tantalizing problems that had evaded the most brilliant of mathematical minds. Among them was his tenth problem, which asked if a general algorithm could be constructed to determine the solvability of any Diophantine equation (those polynomial equations with only integer coefficients and integer solutions). Imagine, for any Diophantine equation of the infinite set of such equations a machine that can tell whether it can be solved. Mathematicians often deal with infinite questions of this nature that exist far beyond resolution by simple extensive observations. This particular problem drew the attention of a Berkeley mathematician named Julia Robinson. Over several decades, Robinson collaborated with colleagues including Martin Davis and Hillary Putnam that resulted in formulating a condition that would answer Hilbert’s question in the negative.

In 1970 a young Russian mathematician named Yuri Matiyasevich solved the problem using the insight provided by Robinson, Davis, and Putnam. With her brilliant contributions in number theory, Robinson was a remarkable mathematician who paved the way to answering one of the greatest pure math questions ever proposed. In a Mathematical Association of America article, “The Autobiography of Julia Robinson”, her sister and biographer Constance Read wrote, “She herself, in the normal course of events, would never have considered recounting the story of her own life. As far as she was concerned, what she had done mathematically was all that was significant.”

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