Definition:Rubik's Cube/Center Facet/Linguistic Note
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Linguistic Note on Center Facet of Rubik's Cube
In the notation $S_Z$ for the center facets of Rubik's cube, the subscript $Z$ is for zentrum, which is German for center.
$C$ cannot be used, because $S_C$ is already in use as the symbol denoting the set of corner facets.
Sources
- 2008: David Joyner: Adventures in Group Theory (2nd ed.) ... (previous) ... (next): Chapter $1$: Elementary, my dear Watson: $\S 1.2$: Elements, my dear Watson: Example $1.2.3$