# Mathematics

### Pythagorean Theorem by Stretching

This unconventional proof may be done with a little of calculus or without; I find it strikingly charming. The proof (by Andrew Stacey) is based on …

### Quadrilateral Inscribed into Parallelogram

The problem is simple enough to be solved with a couple of references to Euclid's Elements. According to Euclid I.38:<p>Triangles which are on equal …

### Big 12 Power Rankings: No gimmes in this conference | Smithology

Hearing from Big 12 coaches how brutal a schedule the league’s 10 teams play is a time-honored tradition at this point. At least this season those …

College Basketball### Divisibility Criteria

Divisibility criteria are ways of telling whether one number divides another without actually carrying the division through. Implicit in this concept …

University of Chicago### Imperial College London and CNRS create joint laboratory to bring world's best mathematicians together - CNRS Web site - CNRS

The joint research unit is the first of its kind between a UK institution and the CNRS and it will have equal status to a CNRS laboratory in France. …

Sciences### Can you solve it? Le Sudoku français est arrivé!

Savour a new puzzle from across the Channel<p>Bonjour guzzleurs!<p>Today’s puzzle comes from France. It is called Garam, and provides some spice for the brain....<p>Like Sudoku, you need to write numbers in a grid. And the rules are self explanatory. Fill in the squares with single digits so that each line …

### The largest known prime number has emerged. It has more than 23 million digits.

There’s a new largest known prime number in town, with a whopping 23,249,425 digits. The figure is calculated by multiplying 2 by itself 77,232,917 times and then subtracting 1. Announced on Jan. 3, the number is almost a million digits longer than the last record-breaking prime.<p>A prime number …

### Complex numbers satisfying Fermat’s identity

Alexander Bogomolny (@CutTheKnotMath) has a post on his website Cut The Knot dealing with proofs of the following fact:<p>The proofs rely, among other …

### Calculating Equilibrium of Forces Through Lami’s Theorem

Proving Lami’s Theorem<p>Consider three forces P, Q, and R exerting over a single point O. Let the angles opposite to these forces be α, β, and γ …

### That’s Entertainment

• <b>January 2016: 3-2-2, goal differential -3 (8 points)</b>• <b><br>January 2017: 4-3-0, goal differential -3 (8 points)</b>• <b><br>January 2018: 3-4-0, goal differential -10 (6</b> …

Ice Hockey### Doron Zeilberger's 158h Opinion

The American Mathematical Society (henceforth AMS) has recently created the position of <i>Diversity Officer</i>, a full-time position, womanned by a …

### Probability of an Odd Number of Sixes

If $0\le k\le n,$ the probability of $k$ sixes turning up in a random toss of $n$ fair dice is $\displaystyle {n\choose …

### Three Complex Numbers Satisfy Fermat's Identity For Prime Powers

Not that $x^6=y^6=2^6=z^6.$ Also, $x+y=2=z$ and $\displaystyle \frac{1}{x}+\frac{1}{y}=\frac{1}{2}=\frac{1}{z}.$<p>Now, all prime numbers are in the …

Education### Mathematicians apology 2 | Recreational mathematics

Cambridge University PressAcademic<p>Cambridge University Press<p>Cambridge Core (Institutional access)<br>• Books Catalogue (Individuals)<p>Cambridge …

Publishing### Symbol for assignment of a truth-value?

Philosophy: Eternal topics, evolving questions →<p>Here’s an odd thing. There seems, browsing along my shelves, to be no standard symbolic …

Philosophy### Draw A Circle. Then Draw A Triangle. Now Solve A Riddle.

Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. There are two …

### Why do we need to know about prime numbers with millions of digits?

Prime numbers are more than just numbers that can only be divided by themselves and one. They are a mathematical mystery, the secrets of which …

### Reddit Ask Me Anything: Prof. Steven Strogatz on applied mathematics

eLife is teaming up with Reddit Science to give you the opportunity to chat directly with Steven Strogatz about his research on January 15, 2018, at …

### Pierre de Fermat and his Last Problem

Pierre de Fermat<p>On January 12, 1665, French lawyer and amateur mathematician <b>Pierre de Fermat</b>, famous for his research in number theory, analytical …

Science### Bringing Wonder Into Mathematics

Lesson 1: A Numberless Word Problem<p>Although the girls weren’t interested in learning the standard, I knew that if I found the right problem, I could …

Education### How to fold a circle into an ellipse

Believe it or not, I used to be a mathematician. And stupidly, I didn’t apply myself to applied math, stuff that uses computers and makes money. I …

### Latinx in the Mathematical Sciences Conference 2018 (Overview)

On March 8-10, 2018, IPAM will host a conference showcasing the achievements of Latinx in the mathematical sciences. The goal of the conference is to …

Education### The math prodigy is back with 'The Imperial March' from 'Star Wars' played on a pencil

Dani Ochoa is back with another amazing pencil song, and this time it's the "Imperial March" from <i>Star Wars</i>.<p>Someone should tell Alfred Nobel to create …

Nobel Prize### It’s Time To Throw Away The Dickensian Culture of Math Education

Strike while the iron is hot…<p>One of my kindred spirits, Peter Harrison, who I had the honor of being mentored by early in my teaching career, used to …

Education### The results of Wales' Maths GCSEs November sittings published

More than half of pupils who took the two GCSE maths exams in Wales in November got a D or below, results published this morning show.<p>Overall results …

Education### Why Can't They Be All Different?

Having solved the problem, I still - very surprisingly - have no feeling as what exactly forces the presence of two equal numbers. The premises …

### How a FedEx employee discovered the world’s largest prime number

He used free software running on a church computer.<p>Jon Pace, a longtime FedEx employee, has loved math since high school. Today, he’s a flight operations finance manager with the Memphis-based delivery behemoth—and is also now credited with discovering the largest prime number currently known. It’s …

Carnegie Mellon University### How to make teenagers love maths

Fingers on buzzers, here’s your starter for 10: how can we make teenagers love maths?<p>This was not a question that I was ever asked on <i>University</i> …

Stephen Fry### Why were prime numbers in the news recently?

Last week, a very big number - over 23 million digits long – became the “largest known prime number.”<p>The number, 277,232,917-1, was discovered using …

### Albert Einstein-Inspired Clock Forces You To Solve Equations To Tell Time

Depending upon your definition of time, it could be the linear progression of events in a nonspatial continuum or simply “that which a clock …

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