When is one thing equal to some other thing? (2007) [pdf](math.harvard.edu)
math.harvard.edu
When is one thing equal to some other thing? (2007) [pdf]
http://www.math.harvard.edu/~mazur/preprints/when_is_one.pdf
1 comments
What a fun, accessible and well-presented paper. I'm not sure who Saunders MacLane is but their memory is served well.
Co-founder of category theory.