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Sep. 14th, 2020 04:38 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
I wonder whether this is the logical structure underneath the magic "three" showing up in many European fairy tales.


Lawvere, Rosenbrugh. Sets for Mathematics, 2003.


Lawvere, Rosenbrugh. Sets for Mathematics, 2003.