Terms containing system of functions

Subject	English	Japanese
phys.	fundamental system of function	基本関数系 (kihon-kansūkei)
phys.	system of functions	関数系 (かんすうけい)
math.	system of orthogonal functions	直交系 (ちょっこうけい)
math.	system of orthogonal functions	直交関数系 (chokkō-kansūkei)