Many objects in mathematics have natural group actions defined on them.

The assignment is a group action on the set of complex structures.

As a result of this group action and other problems, 90 works were withdrawn.

The first full group action took place the next day with three missions being performed.

Instead, he chose to move away from the life of the individual and focus on group action.

The group action of U(n) on this space is the natural one.

This in turn could lead to less group action among the lower class if trying to get more rights or changes within their job field.

So all the subjects are highlighted shortly before group action continues.

Note that there is no notion of a group action in this sense.

More formally, a flow is a group action of the real numbers on a set.