http://en.wikipedia.org/wiki/Ecumenical_council#Eastern_Orthodox_Church vs. http://en.wikipedia.org/wiki/Ecumenical_council#Roman_Catholic_Church . Although in some writings the Catholic Church suggests that an old doctrine might change under “doctrinal development”, at other times it claims that Revelation is not subject to revision, which suggests to me that it cannot drop a once-claimed dogma.
http://en.wikipedia.org/wiki/Ecumenical_council#Eastern_Orthodox_Church vs. http://en.wikipedia.org/wiki/Ecumenical_council#Roman_Catholic_Church . Although in some writings the Catholic Church suggests that an old doctrine might change under “doctrinal development”, at other times it claims that Revelation is not subject to revision, which suggests to me that it cannot drop a once-claimed dogma.