For some reason this word seems familiar, but search was negative.From "engines" 1048:

The book offers a nice calculus-based course. It's
hardly the cookbook instruction that too many
engineers got a century ago. It reads like a medieval
text in logic. Propositions are set in italics. They're
followed by corollaries and scholiums.

scholium
n.,
pl. 3li[a 73!8 or 3li[ums 5ML < Gr scholion < scholc: see SCHOOL16
1 a marginal note or commentary, esp. on the text of a Greek or Latin writer
2 a note added or following, meant to illustrate or develop a point in the text, as in mathematics