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  2. Non-Euclidean geometry - Wikipedia

    en.wikipedia.org/wiki/Non-Euclidean_geometry

    In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry. As Euclidean geometry lies at the intersection of metric geometry and affine geometry , non-Euclidean geometry arises by either replacing the parallel postulate with an alternative, or relaxing the metric ...

  3. Unconventional warfare - Wikipedia

    en.wikipedia.org/wiki/Unconventional_warfare

    Aside from the earlier definition of warfare that is not conventional, unconventional warfare has also been described as: There is another type of warfare— new in its intensity, ancient in its origin—war by guerrillas, subversives, insurgents, assassins; war by ambush instead of by combat, by infiltration instead of aggression, seeking victory by eroding and exhausting the enemy instead of ...

  4. Non-convergent discourse - Wikipedia

    en.wikipedia.org/wiki/Non-convergent_discourse

    A non-convergent discourse (NCD) is a discourse in which the participants do not converge in their language, which results in the use of different languages. [1] Alternative names for this phenomenon are asymmetric and bilingual discourse. The term was introduced by the sociologist Reitze Jonkman.

  5. Nonconformity (quality) - Wikipedia

    en.wikipedia.org/wiki/Nonconformity_(quality)

    In quality management, a nonconformity (sometimes referred to as a non conformance or nonconformance or defect) is a deviation from a specification, a standard, or an expectation. Nonconformities or nonconformance can be classified in seriousness multiple ways, though a typical classification scheme may have three to four levels, including ...

  6. Non-conventional trademark - Wikipedia

    en.wikipedia.org/wiki/Non-conventional_trademark

    A non-conventional trademark, also known as a nontraditional trademark, is any new type of trademark which does not belong to a pre-existing, conventional category of trade mark, and which is often difficult to register, but which may nevertheless fulfill the essential trademark function of uniquely identifying the commercial origin of products or services.

  7. Convention (norm) - Wikipedia

    en.wikipedia.org/wiki/Convention_(norm)

    A convention influences a set of agreed, stipulated, or generally accepted standards, social norms, or other criteria, often taking the form of a custom.. In physical sciences, numerical values (such as constants, quantities, or scales of measurement) are called conventional if they do not represent a measured property of nature, but originate in a convention, for example an average of many ...

  8. Unconventional (oil and gas) reservoir - Wikipedia

    en.wikipedia.org/wiki/Unconventional_(oil_and...

    Schematic unconventional reservoir classification expressed as fluid energy vs flow potential based on initials without stimulation. Unconventional (oil and gas) reservoirs, or unconventional resources (resource plays) are accumulations where oil and gas phases are tightly bound to the rock fabric by strong capillary forces, requiring specialized measures for evaluation and extraction.

  9. Non-classical logic - Wikipedia

    en.wikipedia.org/wiki/Non-classical_logic

    Non-classical logics (and sometimes alternative logics or non-Aristotelian logics) are formal systems that differ in a significant way from standard logical systems such as propositional and predicate logic. There are several ways in which this is commonly the case, including by way of extensions, deviations, and variations.