to study / to learn

instruction; teaching; school; lesson, class

teach; to instruct; give a lesson

mathematics (field of study)

A basin, as at the base of a waterfall. / A pressure point in acupressure or acupuncture. / The core or heart of an issue. / A pot or jar; a vessel or bottle.

hu (ancient Chinese vessel shaped like a vase, usually used to store alcohol)

in class

a visit by a student's guardians to observe the class

(mathematics) pure mathematics

applied mathematics