[see also: complication, problem, trouble
We now indicate how that difficulty can be circumvented.
To get around <overcome> this difficulty, assume......
The proof of Theorem 6 bypasses this difficulty.
We now indicate some of the inherent difficulties.
But this obvious attack runs into a serious difficulty.
The analogue of Theorem 1 presents no difficulty.
The difficulty disappears entirely if......
The only difficulty is in showing that......
As M is ordered, we have no difficulty in assigning a meaning to (a,b).
The difficulty is that it is by no means clear what one should mean by a normal family.
The difficulty consists in generalizing (b).
Some such difficulty is to be expected.