# Secrets of the NOTHING GRINDER

From Mathologer. This video is the result of me obsessing about pinning down the ultimate explanation for what is going on with the mysterious nothing grinder aka the do nothing machine aka the trammel of Archimedes. I think what I present in this video is it in this respect, but I let you be the…

# Fermat’s HUGE little theorem, pseudoprimes and Futurama

From Mathologer. A LOT of people have heard about Andrew Wiles solving Fermat’s last theorem after people trying in vain for over 350 years. Today’s video is about Fermat’s LITTLE theorem which is at least as pretty as its much more famous bigger brother, which has a super pretty accessible proof and which is of…

# Toroflux paradox: making things (dis)appear with math

From Mathologer. Today is all about geometric appearing and vanishing paradoxes and that math that powers them. This video was inspired by a new paradox of this type that Bill Russel from Bakersfield, California discovered while playing with a toroflux. Other highlights to look forward to: a nice new visual proof of Cassini’s Fibonacci identity…

# The PROOF: e and pi are transcendental

From Mathologer. Today’s video is dedicated to introducing you to two of the holy grails of mathematics, proofs that e and pi are transcendental numbers. For the longest time I was convinced that these proofs were simply out of reach of a self-contained episode of Mathologer, and I even said so in a video on…

# The fix-the-wobbly-table theorem

From Mathologer. This video is about the absolutely wonderful wobbly table theorem. A special case of this theorem became well-known in 2014 when Numberphile dedicated a video to it: A wobbling square table can often be fixed by turning it on the spot. Today I’ll show you why and to what extent this trick works,…

# Epicycles, complex Fourier series and Homer Simpson’s orbit

From Mathologer. Today’s video was motivated by an amazing animation of a picture of Homer Simpson being drawn using epicycles. This video is about making sense of the mathematics epicycles. Highlights include the surprising shape of the Moon’s orbit around the Sun, instructions on how you can make your own epicycle drawings, and a crash…

# What’s the Monkey number of the Rubik’s cube?

From Mathologer. The “Monkey number” is the average number of twists it takes to solve a Rubik’s cube starting from a randomly chosen scrambled position and by making random twists. It’s pretty obvious that this number will be gigantic but nobody knows the exact value of this number nor even how gigantic a number we…

# The golden ratio spiral: visual infinite descent

From Mathologer. So you all know the golden (ratio) spiral. But did you know that not only the golden ratio but really every number has such a spiral associated with it? And that this spiral provides key insights into the nature of a number. Featuring more proofs by contradiction by infinite descent (my current obsession),…

# Visualising irrationality with triangular squares

From Mathologer. Get ready for some brand new and very pretty visual proofs of the fact that root 2, root 3, root 5 and root 6 are irrational numbers. Root 2 being irrational also translates into the fact that the equation x^2+x^2=y^2 has no solutions in positive integers, root 3 being irrational translates into the…

# Euler’s and Fermat’s last theorems, the Simpsons and CDC6600

From Mathologer. This video is about Fermat’s last theorem and Euler’s conjecture, a vast but not very well-known generalisation of this super theorem. Featuring guest appearances by Homer Simpson and the legendary supercomputer CDC6600. The video splits into a fairly easygoing first part and a hardcore second part which is dedicated to presenting my take…

# Visualising Pythagoras: ultimate proofs and crazy contortions

From Mathologer. Finally, a Mathologer video about Pythagoras. Featuring some of the most beautiful and simplest proofs of THE theorem of theorems plus an intro to lots of the most visually stunning Pythagoranish facts and theorems from off the beaten track: the Pythagoras Pythagoras (two words :), 60 and 120 degree Pythagoras, de Gua’s theorem,…

# Pi is IRRATIONAL: simplest proof on toughest test

From Mathologer. In the last video of 2017 I showed you Lambert’s long but easy-to-motivate 1761 proof that pi is irrational. For today’s video Marty and I have tried to streamline an ingenious proof due to the famous French mathematician Charles Hermite into the hopefully simplest and shortest completely self-contained proof of the irrationality of…

# Numberphile v. Math: the truth about 1+2+3+…=-1/12

From Mathologer. Confused 1+2+3+…=-1/12 comments originating from that infamous Numberphile video keep flooding the comment sections of my and other math YouTubers videos. And so I think it’s time to have another serious go at setting the record straight by having a really close look at the bizarre calculation at the center of the Numberphile…

# Pi is IRRATIONAL: animation of a gorgeous proof

From Mathologer. This video is my best shot at animating and explaining my favourite proof that pi is irrational. It is due to the Swiss mathematician Johann Lambert who published it over 250 years ago. The original write-up by Lambert is 58 pages long and definitely not for the faint of heart (http://www.kuttaka.org/~JHL/L1768b.pdf). On the…

# Phi and the TRIBONACCI monster

From Mathologer. Today’s video is about explaining a lot of the miracles associated with the golden ratio phi, the Fibonacci sequence and the closely related tribonacci constant and sequence. Featuring the truely monstrous monster formula for the nth tribonacci number, the best golden ratio t-shirt in the universe, rabbits, mutant rabbits, Kepler’s wonderful Fibonacci-Phi link,…