#
Three Easy Pieces:
Imaginary seminar talks in honour
of Bob Rosebrugh

##
Robert Paré

We first take a whimsical look at a couple of questions relating to categories
as generalized posets. Then we study the question of functorial choice
of pullbacks. Finally, we consider a simple question in basic category theory,
with an elementary solution which is surprisingly difficult to generalize to
2-categories.

Keywords:
Adjoint functor, preorder, functorial pullbacks, 2-category

2020 MSC:
18A40, 18B35, 18A30, 18N10, 18D30

*Theory and Applications of Categories,*
Vol. 36, 2021,
No. 6, pp 171-200.

Published 2021-03-01.

http://www.tac.mta.ca/tac/volumes/36/6/36-06.pdf

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