Took me a second to figure out that this wasn't a tutorial in itself, but meant as a companion to another erlang book or class, specifically Simon St. Laurent's Introducing Erlang.
From the author:
"As I continued writing my own examples, I thought they might be useful to other people as well. I contacted Simon St. Laurent, the author of Introducing Erlang, and he liked the idea of having these companion exercises and suggested naming them études"
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[ 3.1 ms ] story [ 11.6 ms ] threadFrom the author:
"As I continued writing my own examples, I thought they might be useful to other people as well. I contacted Simon St. Laurent, the author of Introducing Erlang, and he liked the idea of having these companion exercises and suggested naming them études"
An Études is a particulary hard composition, not an introduction. https://en.wikipedia.org/wiki/%C3%89tude