同余式

congruence (math.) / equation for residue modulo some number

like / same / similar / together / alike / with

see 衚衕|胡同[hu2 tong4]

congruent (math.) / having same residue modulo some number

surname Yu

(archaic) I / me / variant of 餘|余[yu2], surplus

extra / surplus / remaining / remainder after division / (following numerical value) or more / in excess of (some number) / residue (math.) / after / I / me

type / form / pattern / style