Residue
The term residue has several meanings in mathematics.
In complex analysis,
the residue
is a complex number which describes the behavior of path integrals of a meromorphic function around a singularity.
In modular arithmetic, the residue of an integer n to base b is the remainder r after the largest multiple mb of b no greater than n has been subtracted from n (if n < 0, one adds multiples of b just sufficient to make the result non-negative). The residues modulo (to the base) b form a ring.
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