Recently, the noted Vatican theologian, and former member of the Congregation for the Faith, Msgr. Nichola Bux publicly opined that the validity of the resignation of Pope Benedict XVI should be studied in regard to the question of what appears to be substantial error in the formula of resignation. (For a correct English translation of the formula, see here).
Msgr. Bux was not the first to raise this issue. In fact, doubts as to the validity of the act of resignation were raised immediately upon the news being made known. Flavien Blanchon, a French journalist working at Rome, writing only 2 days afterwards, cited an eminent Latin scholar who pointed out errors in the text of abdication, and who noted that the presence of any error, according to canonical tradition, was held to be a sign of lack of deliberation, rendering the act null and void.
Then a year later, Antonio Socci openly speculated that the resignation might be invalid on account of the lack of interior will given by Benedict. In the same year, a very noteworthy study published by a Professor in canon law at the Theological Institute of Legano, Switzerland, in 2014 by Fr. Stefano Violi, which discussed canonically the renunciation: The Resignation of Pope Benedict XVI Between History, Law and Conscience, without, however, raising the question of its invalidity. (Its a must read on account of its rich citation to the canonical history of papal resignations.) However, the study, by identifying the matter of the renunciation to regard the active ministry, not the munus, made it clear that the question of substantial error invalidating the resignation was a real question, founded upon the text of the act itself.
The History of the Controversy, 20 Arguments against Validity, 14 arguments for validity, etc.. continues at fromrome.wordpress.com/…/the-validity-of…