1979 iverson paper

[justin2004]

there are some errata and incorrect OCR'd text in the PDF (linked on April's readme):
https://www.eecg.utoronto.ca/~jzhu/csc326/readings/iverson.pdf

but this source seems pretty good (and you can copy the expressions into a clipboard):
https://www.jsoftware.com/papers/tot.htm

thanks to this user:
https://www.reddit.com/r/apljk/comments/mupbox/iverson_1979_paper_vector_permutation_not_working/gv91drm/

just noting this in case you want the readme to reference that source.

[phantomics]

Thanks, readme will be updated at next commit.

[phantomics]

This has been updated.