Talk:Catamorphism

What?

The definition was obtuse and the example in Haskel is weird!

When one has to flip through links to understand what a definition was trying to say, such a definition is of little value in and of itself. Such definitions are in fact a thin plastic film and not a thick juicy stake!

Additionally, perhaps use of 'actual' computer languages should be avoid in favor of pseudo code that permits more appropriate and clarifying contextual information (as well as spurious cluttering detail). —Preceding unsigned comment added by 174.114.248.239 (talk) 22:56, 16 June 2010 (UTC)

I wholeheartedly agree with the above. I know a little haskell, and the code in the page as it now stands does not appear correct, or at the very least, totally unidiomatic. I'm going to try to change it. HLwiKi (talk) 04:25, 29 November 2010 (UTC)

It's correct but indeed unidiomatic. I've restored the older example. —Ruud 15:28, 13 February 2011 (UTC)

Unfortunately, you do lose some symmetry between the datatype and the algebra when not writing the datatype down in GADT notation. —Ruud 15:32, 13 February 2011 (UTC)

Bad transition?

From the article:

In category theory, catamorphisms are the categorical dual of anamorphisms (and anamorphisms are the categorical dual of catamorphisms).

That means the following. Suppose (A, in) is an ....

Why this reference to anamorphisms? There's no single word about anamorphisms in the following paragraph, and I also don't see any connection (except the duality). -- 132.231.198.38 (talk) 07:43, 26 June 2012 (UTC)

External links modified

Hello fellow Wikipedians,

I have just modified one external link on Catamorphism. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20150610231842/http://cgi.csc.liv.ac.uk/~grant/PS/thesis.pdf to http://cgi.csc.liv.ac.uk/~grant/PS/thesis.pdf

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 18 January 2022).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 03:19, 1 August 2017 (UTC)