Logic: (objective) regulating principles of reality, meaning and truth; (subjective) the systematic study of systems of natural language or artificial notations. The study of arguments and things essential to their appraisal as good or bad. The normative study of good reasoning.There are as many types of logic, as there are types of reasoning, but logic is most closely… Read More

Logical operator: Expressions that connect terms, sentences and variables of various sorts in logical systems. Source: ‘What is Good? What is Bad? The Value of All Values across Time, Place and Theories’ by John McMurtry, Philosophy and World Problems, Volume I-III, UNESCO in partnership with Encyclopedia of Life Support Systems: Oxford, 2004-11.