An Introduction to Business Mathematics
by Henk van Elst
[2015/09] "These lecture notes provide a self-contained introduction
to the mathematical methods required in a Bachelor degree programme
in Business, Economics, or Management:" i.e. linear algebra, matrix
algebra, and single-variable calculus.
The masterpieces of John Forbes Nash Jr
by Camillo De Lellis
[2016/06] 102 pp.
"I have tried to rewrite four famous works
of Nash [on partial differential equations]
in a more modern language while adhering as
much as possible to the original arguments."