For questions about elements which satisfy $x\cdot x=x$ where $\cdot$ is a composition law.
Let $S$ be a set endowed with a composition law $\cdot \colon S\times S\to S$. We say that $x$ is idempotent if $x\cdot x=x$.
Questions tagged [idempotents]
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idempotence number
I recently learned to solve Rubik's Cubes. Along the way I learned that if you repeat any set of moves long enough, the cube will go back the way it was eventually.
I've been wondering for a couple days now if there's some formal mathematical name…
jettero
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