Teacher wangshuyao wrote the notes of operations research course 00 in the front

This series of articles （ The following is abbreviated as this article ） Abbreviate Lagrange as Lag.

Unless otherwise specified , The functions considered in this paper are basically continuous differentiable functions on closed intervals .

What this article says “ The teaching material ” Refers to Tsinghua University Press 《 Operations research 》（ The first 4 edition ）.