[to sth; sth to sth; sth to do sth; see also: employ, use, utilize, pertinent, relevant
Now (5) follows from (4) if (2) is applied to the last equation.
We now apply the previous observation to estimate F.
We apply this to g to obtain......
In particular, the theorem applies to weakly confluent maps.
Actually, [3, Theorem 2] does not apply exactly as stated, but its proof does.