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Reciprocal

From AoPSWiki

The reciprocal of a non-zero number r (usually a real number or rational number, but also a complex number or any non-zero element of a field) is its multiplicative inverse. The reciprocal is usually denoted r^{-1} or \frac 1r.

q and r are multiplicative inverses of each other if and only if r \cdot q = q \cdot r = 1.

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