# general abstract nonsense - a.k.a. category theory

• Dec 9, 2015 · 7:30 PM

Hello fellow friends of the functional!

Aside from the newcomers demand for usable stuff there is the not so occasional demand for *category theory* (yes really).

I took a seminar at university, when I studied mathematics and would be willing to prepare something.

DISCLAIMER: I don't know how much applicable this is in your everyday work or if I can bring any practical examples. So bring a pack of dextrose to enhance brain functionality and maybe a beer or two to moisturize the rather dry topic of functors, categories, duality and whatnot.

If you have any experience or concrete topic suggestions, please leave a comment as it makes my life preparing a whole lot easier. Also if anybody else wants to give a second talk (hint hint).

Cheers Martin

• ##### robertk

very insightful

December 22, 2015

• ##### martin 'ε/2' h.

*** breaking news *** due to maintainence duty on the blinkenwall we will meet in the LOUNGE!

Slides are online at http://github.com/epsilonhalbe/Talks/20151209-Categories

if you want to compile them from the Readme.md - use pandoc --mathjax --filter diagrams-pandoc

ps. diagrams-pandoc is available on github and is a bit buggy

December 9, 2015

• ##### martin 'ε/2' h.

I'll do so in the next few days, pls remind me if I haven't done it till Monday

December 11, 2015

• ##### martin 'ε/2' h.

did it - revealjs and pdf always bug me but managed to export the pdf https://github.com/eps...­

1 · December 14, 2015

• ##### martin 'ε/2' h.

For all those who could not attend - we managed to define category and functor, discussed a lot and saw a few examples.

We also decided to have a second session about categories in February which will be announced soon.

3 · December 10, 2015

• ##### Christian H.

Again: Thank you, Martin, and all participating. Having heard of this basic stuff is good, even though it's still more to learn before I can apply it ;)

December 10, 2015

• ##### Jürgen H.

Thanks, it was an inspiring discussion and I look forward to the session in February.

December 12, 2015

• ##### Peter K.

Will be 10 minutes late. Sry

December 9, 2015

• ##### Peter K.

December 7, 2015

• ##### Christian H.

Thank you Martin for this meetup; I have no knowledge about category theory and I am only starting out with functional programming. And I'll be perfectly fine if most of the stuff from your talk flies straight over my head - at least I've heard it once :P

November 13, 2015

• ##### martin 'ε/2' h.

Nice that you'll come nevertheless - don't forget to ask questions if something is unclear!

November 13, 2015

• ##### Peter K.

Yes, this is what I need. Surely you will talk about Monads theory as well. I marked my calendar!

October 17, 2015

• ##### Peter K.

Just general category theory will do for a start. Background and concepts...

October 17, 2015

• ##### martin 'ε/2' h.

ok - this will be the focus, basic concepts and background

1 · October 17, 2015

• ##### A former member

Would have loved to attend but I'm only here till December 2nd.

October 16, 2015

• ##### martin 'ε/2' h.

sad to hear - I will link the slides or post them somwhere accessible.

October 17, 2015

### 15 went

• ##### robertk
• A former member

### Vienna, Austria

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