This makes defining and identifying subversion a difficult process. One of the challenges in defining death is in distinguishing it from life. Scientologists affirm the existence of a deity without defining or describing its nature. This is analogous to defining formula 36. Definitions vary, contributing to the challenge of defining empathy. What are the necessary components for defining consciousness? There are many ways of defining execution semantics. MediaWiki offers flexibility in creating and defining user groups. Hair is one of the defining characteristics of mammals. Simply enough the covenant specifically is not defining the content of propaganda. There are various ways of defining a line. This can be proven by letting and using the defining identity . Functors are represented by arrows between categories, subject to specific defining commutativity conditions. It has long been her defining characteristic. There was some controversy as to the choice of RMSE as the defining metric.