Assume that formula 25 is defined, i.e. formula 26. Goals can be explicitly defined or induced. Analogous concepts can be defined for edges. The term secondary is not defined or mentioned. "Continents" may be defined differently for specific purposes. Also and can be defined similarly. Absolute zero was defined as precisely and . The goal should be objectively defined and understandable for the individual. The relationships cannot be defined as bisexuality. This can be defined using the equation. Otherwise, properties can be defined in any order. Indeed, the function need not even be defined at . It should be clearly defined, and regularly evaluated. Fields can also be defined in different, but equivalent ways. For , the space is defined as follows.