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Erratum noted by Graeme Robertson

Vector 20:3, page 115

APL community language design

Transcribed from the printed issue; not yet reviewed. Read it in the PDF of the issue, page 115

Erratum noted by Graeme Robertson

Thanks for printing my New Foundations article. There was a small printing error with the APL on the page 138 title line

3. Promotion of primitives

but that is not very important. There was also a small oversight in the code on the next page on a line which should have read:

VF←{⍵*0},{⍵},{⍵*2},{⍵*3}

because the valence of each function must be explicit or the whole construction of function arrays breaks down. This was part of my motivation for introducing the one-line and no-braces precursor of Dfns.