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  2. Principle - Wikipedia

    en.wikipedia.org/wiki/Principle

    A principle is a fundamental truth or proposition that serves as the foundation for a system of beliefs or behavior or a chain of reasoning. [2] That is a guide for behavior or evaluation. In law, it is a rule that has to be or usually is to be followed. It can be desirably followed, or it can be an inevitable consequence of something, such as ...

  3. Principal value - Wikipedia

    en.wikipedia.org/wiki/Principal_value

    Principal value. In mathematics, specifically complex analysis, the principal values of a multivalued function are the values along one chosen branch of that function, so that it is single-valued. A simple case arises in taking the square root of a positive real number. For example, 4 has two square roots: 2 and −2; of these the positive root ...

  4. Principal investigator - Wikipedia

    en.wikipedia.org/wiki/Principal_investigator

    Principal investigator. In many countries, the term principal investigator ( PI) refers to the holder of an independent grant and the lead researcher for the grant project, usually in the sciences, such as a laboratory study or a clinical trial. The phrase is also often used as a synonym for "head of the laboratory" or "research group leader".

  5. First principle - Wikipedia

    en.wikipedia.org/wiki/First_principle

    First principle. 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 [1] attitudes and taught by Aristotelians, and nuanced versions of first principles are referred to as postulates by Kantians. [2 ...

  6. Bernoulli's principle - Wikipedia

    en.wikipedia.org/wiki/Bernoulli's_principle

    Bernoulli's principle can be derived from the principle of conservation of energy. This states that, in a steady flow, the sum of all forms of energy in a fluid is the same at all points that are free of viscous forces. This requires that the sum of kinetic energy, potential energy and internal energy remains constant.

  7. Uncertainty principle - Wikipedia

    en.wikipedia.org/wiki/Uncertainty_principle

    Uncertainty principle of Heisenberg, 1927. The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known.

  8. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    The empirical principle is usually known as the Pareto principle. With regard to variation causality, this principle states that there is a non-random distribution of the slopes of the numerous (theoretically infinite) terms in the general equation. All of the terms are independent of each other by definition.

  9. Vice-principal - Wikipedia

    en.wikipedia.org/wiki/Vice-principal

    Vice-principal. In larger school systems, a head teacher principal is often assisted by someone known as a vice-principal, deputy principal, or assistant/associate principal. Unlike the principal, the vice-principal does not have quite the decision-making authority that the principal carries. Although they still carry nearly the same authority ...