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APL ∊ BCN logo.

APL ∊ BCN is a user group based in Barcelona started by Michail Liarmakopoulos in late November 2021. Its activities are currently exclusively online due to the continuing impact of the COVID-19 pandemic, but plans exist for transitioning to regular physical meetups in Barcelona every four weeks, with additional online events every two–three weeks.

It is the first user group based in a country where Spanish is the majority language, but meetings will be held in English to be as accessible as possible.


The group was founded with the goals of:

  • spreading knowledge of APL and the array family of programming languages.
  • spreading knowledge about Ken Iverson and other people involved in the development of APL.
  • sharing knowledge related to the intersection of mathematics and programming.
  • fostering a friendly community of people interested in array programming.


The group organises three distinct types of meetings: general meetings, a historical APL paper reading group, and a general reading group.

General meetings

Date Time Title Subjects Sign-up Meeting link Video Slides
2021-12-18 19:00–20:30 CET APL: A different Programming Language How to keep calm and not be afraid of the glyphs, monadic and dyadic functions, operators, function axis Meetup Zoom: 758 323 8770 01:42:01 PDF

Historical APL paper reading group

Date Time Title Subjects Sign-up Meeting link

General reading group

Date Time Title Subjects Sign-up Meeting link

External links

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