I'm writing here as a reader, not an editor.
- The second -8 here should be -9:
(vector-unfold (λ (i x) (values x (- x 1)))
10 0)
#(0 -1 -2 -3 -4 -5 -6 -7 -8 -8)
- Later, "...each respective elements..." should be "...each respective element..." (singular).
- The example arguments to kons in vector-fold don't match the description; they include an index as well. Perhaps they're examples of vector-fold/index.
- vector->list appears in the index but not in the body.