# This is the (co)end, my only (co)friend

• Published in 2015
In the collection
The present note is a recollection of the most striking and useful applications of co/end calculus. We put a considerable effort in making arguments and constructions rather explicit: after having given a series of preliminary definitions, we characterize co/ends as particular co/limits; then we derive a number of results directly from this characterization. The last sections discuss the most interesting examples where co/end calculus serves as a powerful abstract way to do explicit computations in diverse fields like Algebra, Algebraic Topology and Category Theory. The appendices serve to sketch a number of results in theories heavily relying on co/end calculus; the reader who dares to arrive at this point, being completely introduced to the mysteries of co/end fu, can regard basically every statement as a guided exercise.

## Other information

pages
39

### BibTeX entry

@article{Loregian2015,
abstract = {The present note is a recollection of the most striking and useful applications of co/end calculus. We put a considerable effort in making arguments and constructions rather explicit: after having given a series of preliminary definitions, we characterize co/ends as particular co/limits; then we derive a number of results directly from this characterization. The last sections discuss the most interesting examples where co/end calculus serves as a powerful abstract way to do explicit computations in diverse fields like Algebra, Algebraic Topology and Category Theory. The appendices serve to sketch a number of results in theories heavily relying on co/end calculus; the reader who dares to arrive at this point, being completely introduced to the mysteries of co/end fu, can regard basically every statement as a guided exercise.},
author = {Loregian, Fosco},
month = {jan},
pages = 39,
title = {This is the (co)end, my only (co)friend},
url = {http://arxiv.org/abs/1501.02503 http://arxiv.org/pdf/1501.02503v2},
year = 2015,
archivePrefix = {arXiv},
eprint = {1501.02503},
primaryClass = {math.CT},
urldate = {2015-01-13},
collections = {Attention-grabbing titles}
}