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* [http://www.softwarepreservation.org/projects/apl Software Preservation Group] (subfolders in sidebar) | * [http://www.softwarepreservation.org/projects/apl Software Preservation Group] (subfolders in sidebar) | ||
* [http://www.mcintyre.me.uk/ APL-J Language] Donald McIntyre | * [http://www.mcintyre.me.uk/ APL-J Language] Donald McIntyre | ||
* [http://www.sigapl.org/articles.php Articles] and [http://www.sigapl.org/APLChronology.php APL Chronology] (timeline with links) from [[SIGAPL | * [http://www.sigapl.org/articles.php Articles] and [http://www.sigapl.org/APLChronology.php APL Chronology] (timeline with links) from [[SIGAPL]] | ||
* [http://ed-thelen.org/comp-hist/APL-hist.html A Personal History of APL] by Michael S. Montalbano | * [http://ed-thelen.org/comp-hist/APL-hist.html A Personal History of APL] by Michael S. Montalbano | ||
* [[File: 1_The_Derivative_Revisited.pdf]] | * [[File: 1_The_Derivative_Revisited.pdf]] [[Mike Powell]] | ||
A fresh look at Ken Iverson's 1979 paper "The Derivative Operator" | A fresh look at Ken Iverson's 1979 paper "The Derivative Operator". | ||
* [[File: 2_The_Derivative_Rules.pdf]] [[Mike Powell]] | * [[File: 2_The_Derivative_Rules.pdf]] [[Mike Powell]] | ||
In 1979 Ken Iverson wrote a paper on the derivative as part of the ACM APL Conference. That paper included a section summarizing the rules for the derivatives of compound formulations such as f×g. His summary omits the derivation of these rules. This article aims to restate these rules in more modern notation and provide derivations for Iverson's results. | In 1979 Ken Iverson wrote a paper on the derivative as part of the ACM APL Conference. That paper included a section summarizing the rules for the derivatives of compound formulations such as f×g. His summary omits the derivation of these rules. This article aims to restate these rules in more modern notation and provide derivations for Iverson's results. | ||