Previewing "Welcome to Math 4 Wisdom". The Foursome - whether, what, how, why - relates levels of knowledge. I think it is expressed by the #Yoneda Lemma.

Did you know that
#Yoneda, the youngest ever candidate, will become the third female #astronaut in #JAXA (Japan #Aerospace Exploration Agency)

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@maxsnew Thank you! I look forward to trying to understand you. I wonder what you will have to say about the #Yoneda lemma?

Cool blog post about the Yoneda lemma: https://www.math3ma.com/blog/the-yoneda-perspective

#categoryTheory #mathematics #yoneda

@brab
That paper looks pedagogical indeed :)

As for myself I've mainly used #BartoszMilewski 's #CategoryTheory for #Programmers: « There is a free pdf version of this #book with nicer typesetting available for download. You may order a hard-cover version with color illustrations at #Blurb. Or you may watch me #teaching this material to a live audience. »
https://bartoszmilewski.com/2014/10/28/category-theory-for-programmers-the-preface/

He has also written a few articles for the #SchoolOfHaskell, including a few on #Yoneda: https://www.schoolofhaskell.com/user/bartosz