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  2. Koch's postulates - Wikipedia

    en.wikipedia.org/wiki/Koch's_postulates

    Koch's postulates (/ k ɒ x / KOKH) [2] are four criteria designed to establish a causal relationship between a microbe and a disease. The postulates were formulated by Robert Koch and Friedrich Loeffler in 1884, based on earlier concepts described by Jakob Henle , and the statements were refined and published by Koch in 1890. [ 3 ]

  3. Molecular Koch's postulates - Wikipedia

    en.wikipedia.org/wiki/Molecular_Koch's_postulates

    As per Falkow's original descriptions, the three postulates are: [1] "The phenotype or property under investigation should be associated with pathogenic members of a genus or pathogenic strains of a species. Specific inactivation of the gene(s) associated with the suspected virulence trait should lead to a measurable loss in pathogenicity or ...

  4. Hammond's postulate - Wikipedia

    en.wikipedia.org/wiki/Hammond's_postulate

    Hammond's postulate (or alternatively the Hammond–Leffler postulate), is a hypothesis in physical organic chemistry which describes the geometric structure of the transition state in an organic chemical reaction. [1] First proposed by George Hammond in 1955, the postulate states that: [2]

  5. Playfair's axiom - Wikipedia

    en.wikipedia.org/wiki/Playfair's_axiom

    This line is parallel because it cannot meet and form a triangle, which is stated in Book 1 Proposition 27 in Euclid's Elements. [15] Now it can be seen that no other parallels exist. If n was a second line through P , then n makes an acute angle with t (since it is not the perpendicular) and the hypothesis of the fifth postulate holds, and so ...

  6. Point–line–plane postulate - Wikipedia

    en.wikipedia.org/wiki/Point–line–plane_postulate

    The axiomatic foundation of Euclidean geometry can be dated back to the books known as Euclid's Elements (circa 300 B.C.). These five initial axioms (called postulates by the ancient Greeks) are not sufficient to establish Euclidean geometry. Many mathematicians have produced complete sets of axioms which do establish Euclidean geometry.

  7. Axiom - Wikipedia

    en.wikipedia.org/wiki/Axiom

    An axiom, postulate, or assumption is a statement that is taken to be true, to serve as a premise or starting point for further reasoning and arguments. The word comes from the Ancient Greek word ἀξίωμα (axíōma), meaning 'that which is thought worthy or fit' or 'that which commends itself as evident'. [1] [2]

  8. Morphometrics - Wikipedia

    en.wikipedia.org/wiki/Morphometrics

    Onymacris unguicularis beetle with landmarks for morphometric analysis. In landmark-based geometric morphometrics, the spatial information missing from traditional morphometrics is contained in the data, because the data are coordinates of landmarks: discrete anatomical loci that are arguably homologous in all individuals in the analysis (i.e. they can be regarded as the "same" point in each ...

  9. Foundations of geometry - Wikipedia

    en.wikipedia.org/wiki/Foundations_of_geometry

    Based on ancient Greek methods, an axiomatic system is a formal description of a way to establish the mathematical truth that flows from a fixed set of assumptions. Although applicable to any area of mathematics, geometry is the branch of elementary mathematics in which this method has most extensively been successfully applied.

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