同余类

同余类	tóng yú lèi	(math.) congruence class; residue class
同	tóng	like / same / similar / together / alike / with
同	tòng	see 胡同
同余	tóng yú	congruent (math.) / having same residue modulo some number
余	Yú	surname Yu
余	yú	(literary) I; me / variant of 余
余	yú	extra / surplus / remaining / remainder after division / (following numerical value) or more / in excess of (some number) / residue (math.) / after / I / me
类	lèi	kind / type / class / category / similar / like / to resemble