Alternative spelling of 非線形

solve (a problem); answer (a question); unravel (a riddle) / comb; untangle (hair)

untie; unravel; undo (a fastening); unwrap / dispel (doubts); clear up (a matter)

Alternative spelling of 線形

needed, necessary

need, necessity

(mathematics, chemistry) an equation

negative prefix: in-, non-, un-

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

not / bad / fault