Math is an exotic and confusing country. We speak a bizarre language, full of homeomorphisms, differential varieties, transfinite numbers. But we also find epic landscapes, dizzying ideas and even, sometimes, useful things!
Episodes Season Season 2 · 0/10 Season 1 · 0/10 0/10 watched · 2023 S02E01 The Monty Hall Problem 2023-10-10 10m
The Monty Hall paradox, named after a game show from the 60s, concerns the way in which information acquired during the course of a game modifies (or not) the winning statistics.
Theoretically solved, the question is so disturbing to our worldview that it continues to be the subject of passionate debate to this day. more S02E02 Simpson's Paradox 2023-10-10 10m
Statistics seem, almost by their very nature, to convey a positivist message. They are, in fact, a formidable tool in the attempt to master the complexity of the real world...
But numerous "biases" threaten any discourse that refers to them without care: an over-simplistic reading of the figures can lead us - for example - to confuse correlation with causation... And more complex phenomena (notably Simpson's paradox) can distort conclusions that seem objective. more S02E03 Non-Euclidean Geometries 2023-10-10 10m
For centuries, geometry was based on Euclid's postulates, which seemed eternal and irrevocable.
However, one of the postulates (the fifth) has always seemed "a little less natural" than the others, and hundreds of mathematicians have tried in vain to do without it by deducing it from the other postulates. In the mid-19th century, Bernhard Riemann came up with a novel idea: let's imagine it's false! This was the birth of "non-Euclidean geometries", which would later have major applications in physics. more S02E04 Planar Tessellations 2023-10-10 10m
A tessellation is a way of covering a plane with a repeating pattern... Basically, it's like creating wallpaper.
In 1975, Marjorie Rice (1923- 2017), a mother and amateur mathematician, read an article by Martin Gardner in Scientific American that listed ALL possible "pentagonal tessellations" in the plane. A mathematician had just proved that the list was complete. Except that Marjorie, working alone at home, found 4 new ones... The theorem was wrong! more S02E05 Graph Theory 2023-10-10 10m
The question is how to make a network that is both "economical" and "robust" without taking up too much space.
This is a theoretical question worked on by the great Russian mathematician Andrey Kolmogorov (1903-1987). But this theoretical question also conditions the way in which we can build a computer network or... a human brain: to be intelligent without having a big head, you need a neural network that is efficient BUT ALSO compact! Mention Szemeredi lemma? more S02E06 Alicia Boole in the Land of Polytopes 2023-10-10 10m
To begin with, there are the five "Platonic solids" beloved of geometers: the cube, the tetrahedron, the octahedron, the dodecahedron and the icosahedron. But why stop at the 3 dimensions of ordinary space?
Alicia Boole Stott has devoted her life to finding regular solids in dimension 4... and she's found them! A journey into unsuspected mathematical regions. more S02E07 The Kepler Conjecture, or How to Store Your Cannonballs 2023-10-10 10m
When mathematics tells us the best way to stack oranges...
Formulated in 1611, Kepler's conjecture was finally proved by Thomas Hales... in 1998! Using computational methods unorthodox for his colleagues. The certification of mathematical demonstrations is an arduous and tedious process. more S02E08 Chaos Theory or Order in Disorder 2023-10-10 10m
Can the flap of a butterfly's wings in Brazil trigger a tornado in Texas?
Behind Edward Lorenz's all-too-famous question lies a mathematical theory of things we'd never imagined before belonged to the land of maths: complex systems like those that describe the weather, or even... human affairs! more S02E09 Kovaleskaya's Spinning Top or The Best Way to Spin 2023-10-10 10m
How do you model the movement of a potato in space? Many a mathematician has struggled with this question.
At the end of the 19th century, mathematician Sofia Kovalevskaya finally obtained an important result for determining the motion of a solid around a fixed point, thanks to a very special spinning top. A little expedition to the heart of integrable systems, even if it's a bit dizzying... more S02E10 Entscheidungsproblem: The End of Mathematics? 2023-10-10 10m
Imagine a world where a machine could calculate true and false...
Failing that, Church, Herbrand, Gödel and Turing each tried in their own way to determine whether an algorithm could decide whether or not a mathematical assertion could be proved. The Entscheidungsproblem, the decision problem that rocked maths and, in the process, laid the foundations of computer science. more 
