In the zip archive for Dr. Iverson's book
https://code.jsoftware.com/wiki/Books#Math_for_the_Layman
there exists a typographic error.
Search for deinition near the end
"A deinition may be displayed directly without displaying the
Vocabulary: simply place the cursor just to the left of the symbol, and
press F1 while holding down the control key"
Also you might consider changing x. and y. to x and y . Or not.
Thanks, apologizing if wrong forum.
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