A Commentary on APL Development
Kenneth E. Iverson

Introduction
Box
Cycle, Mix, and Mix Index
Nub in, Nubsieve, and Nub
Less
Nand, Nor, Right, and Left
Words
Circle
From, All, Merge
Swap
Under
Rank
Tie
Prefer, Defer
Ply
Union, Intersection
Yoke
Sets
Set-like operations
Acknowledgments
References