There is also an opinion which holds that there are no abrogatedverses, whatsoever, within the Qur'an. Is this true ?

There are scholars who are of the view that there are no abrogated verses in the Qur'an. A good, and authoritative, majority of the scholars, however, tend to say that such a viewpoint would be incorrect. These scholars uphold, as the most important point in their favour, the fact that the Qur'an itself has indicated this possibility. The relevant verses are as follows:

'None of Our revelations do We abrogate or cause to be forgotten, but We substitute something better or similar: knowest thou not that God hath power over all things ?' (2:106)

'When We substitute one revelation for another - and God knows best what He reveals (in stages) - They say, 'Thou art but a forger' but most of them know not.' (16:101)

It is the contention of those who claim that there is not extant any abrogated verse in the Qur'an that these verses refer to the abrogation of the previously revealed scriptures by the Qur'an itself. Furthermore, they contend that it would be possible to so interpret the supposedly abrogated verses as to make them to conform with the meaning of the newly revealed laws. As for those scholars who oppose this view, they believe that to so interpret it would be quite unnecessary and that it would be more logical to say that the earlier rulings were, indeed, abrogated.

Both these conflicting views, notwithstanding, it has been accepted by the two sides, at least in theory, that some of the laws which prevailed in the initial stages of the reforming mission were, however, rendered irrelevant by the time of the last phase. Indeed, the moot point in this difference of opinion has only been the question as to whether the term abrogation may, or may not, be used  in the context.