Giulio Fellin / Curiosities

Curiosities.

Short essays and curiosities on mathematics, logic, culture and everyday phenomena, listed from newest to oldest.

The Curious Case of Poirot’s Centrality

A graph-theoretic journey through Agatha Christie’s recurring characters, identifying Hercule Poirot as their unique centre.

Why the expression “indeterminate form” can be misleading: a closer look at 0/0, 0⁰, limits, and mathematical definitions.

What makes a riddle meaningful? Hidden rules, numerical sequences, and the paradox of thinking outside the box.

The birthday paradox, surprising coincidences, and why apparent predictions are often less improbable than we think.