# Tambara Equipment

DevFeed: [Tambara Equipment](<https://devfeed.tech/articles/tambara-equipment-28862.md>)

Original publisher: [Read original article](<https://bartoszmilewski.com/2026/07/11/tambara-equipment/>)

Author: Bartosz Milewski

Published: 2026-07-11T08:13:34Z

Content type: article

Language: en

Sources: [Bartosz Milewski's Programming Cafe](<https://devfeed.tech/sources/bartosz-milewski-s-programming-cafe.md>)

Topics: [modules](<https://devfeed.tech/topics/modules.md>), [Haskell](<https://devfeed.tech/topics/haskell.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [category-theory](<https://devfeed.tech/tags/category-theory.md>), [code](<https://devfeed.tech/tags/code.md>), [double-categories](<https://devfeed.tech/tags/double-categories.md>), [double-category](<https://devfeed.tech/tags/double-category.md>), [haskell](<https://devfeed.tech/tags/haskell.md>), [modules](<https://devfeed.tech/tags/modules.md>), [optics](<https://devfeed.tech/tags/optics.md>), [proarrow-equipment](<https://devfeed.tech/tags/proarrow-equipment.md>), [profunctors](<https://devfeed.tech/tags/profunctors.md>), [structure](<https://devfeed.tech/tags/structure.md>), [tambara-modules](<https://devfeed.tech/tags/tambara-modules.md>), [tannakian-reconstruction](<https://devfeed.tech/tags/tannakian-reconstruction.md>), [theory](<https://devfeed.tech/tags/theory.md>), [transformation](<https://devfeed.tech/tags/transformation.md>)

## AI overview

This article explains Tambara modules through category theory and illustrates the concepts with Haskell code. It discusses their relationship to profunctors, monoidal actions, double categories, proarrow equipment, and Tannakian reconstruction.

## Source excerpt

I was originally attracted to category theory when trying to understand Haskell optics. I was puzzled by the van Laarhoven's functor representations and Kmett's use of Tambara modules. By playing Tetris with the Yoneda lemma I was able to make some progress, attacking more and more esoteric topics. With a group of researcher and students [...]