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- Dictionaryfirst principles
plural
- 1. the fundamental concepts or assumptions on which a theory, system, or method is based: "I think we have to start again and go right back to first principles"
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Concept
In philosophy and science, a first principle is a basic proposition or assumption that cannot be deduced from any other proposition or assumption. First principles in philosophy are from first cause attitudes and taught by Aristotelians, and nuanced versions of first principles are referred to as postulates by Kantians. Wikipedia