Thisbookisaimedatallthosewhoarerightlypuzzledbythecomplexandcontroversialpanoramaofformalmethods.Itisuniqueastoitscompletenessanditscompromisebetweenrigorousexpositionofunderlyingmathematicaltheoriesandconcreteexplanationsoftheimplementationoftechniquesusingactualtools.Oneofitsess