So far so good - but this still left me with what was to prove the most controversial part of the whole social security review.

This proved without doubt the most difficult part for me.

It is time for him to prove at least the first part of his tale.

To prove the second part of the theorem, we just let "z" tend to "z".

For the inductive case, we first prove the first part.

The role of naval officer, however, proved the most taxing part he ever had to play.

According to Portuguese beekeepers, one aspect of this programme has proved essential: the part relating to varroasis control.

In this way we have now proven the first part of the theorem.

But maybe we can prove the other part.

This proves the only if part of the theorem.