Y.S.Han Finite fields A field with finite order is a finite field. a-b=a+(-b),where-b is the additive inverse of b. 。a÷b=a·b1,where b-1 is the multiplicative inverse of b. School of Electrical Engineering Intelligentization,Dongguan University of TechnologyY. S. Han Finite fields 8 • A field with finite order is a finite field. • a − b ≡ a + (−b), where −b is the additive inverse of b. • a ÷ b ≡ a · b −1 , where b −1 is the multiplicative inverse of b. School of Electrical Engineering & Intelligentization, Dongguan University of Technology