## question

An obvious question to ask is whether Theorem 1 continues to hold for ......

A natural question is how sharp the bounds given in Theorem 6 are.

The question we shall be concerned with is whether or not $f$ is ......

The question naturally arises whether this representation is unique.

Here the interesting questions are not about individual examples, but about the asymptotic behaviour of the set of examples as one or another of the invariants (such as the genus) goes to infinity.

The question of whether $B$ is ever strictly larger than $A$ remains open. [Or: The question whether]

Incidentally, the question of whether $K(E)$ is amenable for specific Banach spaces $E$ seems to have received almost no attention in the literature.

The question as to how often we should expect the class number to be divisible by $p$ is also of some interest.

Put this way, the question is not precise enough.

This question was answered negatively in [5].

The two questions listed below remain unanswered.

This brings about the natural question of whether or not there is any topology on the set of all possible itineraries.

The lemma raises an interesting question: ......

This suggests a question: under what conditions is it true that ...... ?

We close this paper by offering some questions and problems for further research.

It is generally a highly nontrivial question whether ......

When $A$ is commutative, the answer to both questions is `yes'.

The continuum in question is then called arc-like.

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