Dental amalgam controversy pages, its research on the subject of amalgam safety concluded that "there is no scientific evidence for risks of adverse systemic effects exist ["sic"] and the current use of dental amalgam does not pose a risk of systemic disease." England and Scotland recognize the safety and effectiveness of amalgam restorations. A policy statement from the British Dental Health Foundation states that they do not consider amalgams containing mercury a significant health risk. Ireland recognizes the safety and effectiveness of amalgam restorations. The Irish Dental Association has published on their website: "Dental amalgam has been used on patients for over 150
Real element formula_1, Every involution is strongly real. Furthermore, every element that is the product of two involutions is strongly real. Conversely, every strongly real element is the product of two involutions. If and formula_1 is real in formula_2 and formula_30 is odd, then formula_1 is strongly real in formula_2. The extended centralizer of an element formula_1 of a group formula_2 is defined as making the extended centralizer of an element formula_1 equal to the normalizer of the set The extended centralizer of an element of a group formula_2 is always a subgroup of formula_2. For involutions or non-real elements, centralizer and