出典:Wikipedia
出典:『Wikipedia』 (2011/07/29 21:04 UTC 版)
In geometry, a point group is a group of geometric symmetries (isometries) that keep at least one point fixed. Point groups can exist in a Euclidean space with any dimension, and every point group in dimension d is a subgroup of the orthogonal group O(d). Point groups can be realized as sets of orthogonal matrices M that transform point x into point y:
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7 point
群らがって.
the goal line
the collective mind
the remarks column
the remarks column
the flashing-point