同餘

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

like / same / similar / together / alike / with

see 衚衕|胡同[hu2 tong4]

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

surname Yu

variant of 餘|余[yu2], remainder

congruence class (of integers modulo n)

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