一般说来，群指的是满足以下四个条件的一组元素的集合：（1）封闭性 （2）结合律成立 （3）单位元存在 （4）逆元存在。
代数群 [数] algebraic group
单参数群 [数] one-parameter group
系数群 [数] coefficient group ; group of coefficients ; coefficient accumulation
性少数群体 LGBT ; LGBTQ
殆单代数群 [数] almost simple algebraic group
少数群 minority group
同种代数群 isogeneous algebraic group
参数群 population of parameters ; parameter group
无量纲数群 dimensionless group
仿射代数群 [数] affine algebraic group ; affine algebraic k-groups
助理首席警官Terry Sweeney说：“有几家店铺被聚集的且疑似有闹事企图的数群年轻人袭击。”
Assistant Chief Constable Terry Sweeney said: "A handful of shops have been attacked by groups of youths who have congregated and seem intent on committing disorder.
为了绘制这些双曲线选定c值是具有主观性的（主要是为了包括这些数据点），不过这样就能辨别观察点从数群中的偏离。
The selection of the value of c for drawing these contours is arbitrary (and chosen to include the bulk of the points), but nevertheless serves to identify observations removed from the data swarm.
他们平衡的平面，由一小群人的集合，或者他们所谓的流量数。
Their balanced sheet consists of small collections of people or what they call traffic counts.
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