Element arithmetic

• gf_add — Adds elements of a finite field
• gf_are_equal — Tests whether two arrays have the same size and entries
• gf_divide — Divides elements of a finite field
• gf_is_one — Tests whether an array represents the unit element
• gf_is_zero — Tests whether all coefficients of an array are zero
• gf_multiply — Multiplies elements of a finite field
• gf_power — Raises elements of a finite field to an integer power
• gf_subtract — Subtracts elements of a finite field