📖 Index (Discrete Logarithm)

If $g$ is a primitive root modulo $p$ and $a \\equiv g^k \\pmod{p}$, then $k$ is called the index of $a$ to base $g$, written $\\text{ind}_g(a) = k$. This is the discrete logarithm.

From: Disquisitiones Arithmeticae

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