This problem comes from an exam in 1888 for secondary school students. It was actually optional so it was considered to be a challenging problem. I bet some students today will struggle with it too, but it's the kind of problem solving I think we should all…

It’s all about speed!

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I make comedy shows about science with Festival Of The Spoken Nerd. Here's a clip from our latest show where I use maths to live manipulate…

Zero factorial is 1, but what is subfactorial of 0?
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Featuring Neil Sloane from the Online Encyclopedia of Integer Sequences (OEIS). Lunar Arithmetic (aka Dismal Arithmetic)
More links & stuff in full description below ↓↓↓

Neil Sloane is the founder of the OEIS: https://oeis.org

Lunar Primes: https://oeis.org/A087097…

Condições necessárias e suficientes para que um fluxo geodésico em superfícies não compactas seja do tipo Anosov
Sergio Augusto Romaña Ibarra
Nesta palestra mostraremos que quando o fluxo édo tipo Anosov, então a média das curvature seccionias ao longo de…

something over zero vs. something over infinity, these aren't indeterminate forms! Watch to find out how to figure out these limits limits of sin(ln(x))/x, x...

In this video, I prove the famous Riemann-Lebesgue lemma, which states that the Fourier transform of an integrable function must go to 0 as |z| goes to infinity.

This is one of the results where the proof is more important than the theorem, because it's…