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  2. Opposite - Wikipedia

    en.wikipedia.org/wiki/Opposite

    A complementary antonym, sometimes called a binary or contradictory antonym (Aarts, Chalker & Weiner 2014), is one of a pair of words with opposite meanings, where the two meanings do not lie on a continuous spectrum. There is no continuous spectrum between odd and even but they are opposite in meaning and are therefore complementary antonyms.

  3. Symmetric difference - Wikipedia

    en.wikipedia.org/wiki/Symmetric_difference

    Now consider two subsets of S and set their distance apart as the size of their symmetric difference. This distance is in fact a metric, which makes the power set on S a metric space. If S has n elements, then the distance from the empty set to S is n, and this is the maximum distance for any pair of subsets. [6]

  4. Unity of opposites - Wikipedia

    en.wikipedia.org/wiki/Unity_of_opposites

    It is the stable tension between the opposites that accounts for the unity, and in fact, the opposites presuppose one another analytically. For example, 'upward' cannot exist unless there is a 'downward', they are opposites but they co-substantiate one another, their unity is that either one exists because the opposite is necessary for the ...

  5. Good and evil - Wikipedia

    en.wikipedia.org/wiki/Good_and_evil

    The two questions are subtly different. One may answer the first question by researching the world by use of social science, and examining the preferences that people assert. However, one may answer the second question by use of reasoning, introspection, prescription, and generalization.

  6. Homogeneity and heterogeneity - Wikipedia

    en.wikipedia.org/wiki/Homogeneity_and_heterogeneity

    Homogeneity and heterogeneity; only ' b ' is homogeneous Homogeneity and heterogeneity are concepts relating to the uniformity of a substance, process or image.A homogeneous feature is uniform in composition or character (i.e., color, shape, size, weight, height, distribution, texture, language, income, disease, temperature, radioactivity, architectural design, etc.); one that is heterogeneous ...

  7. Indistinguishable particles - Wikipedia

    en.wikipedia.org/wiki/Indistinguishable_particles

    For two indistinguishable particles, a state before the particle exchange must be physically equivalent to the state after the exchange, so these two states differ at most by a complex phase factor. This fact suggests that a state for two indistinguishable (and non-interacting) particles is given by following two possibilities: [2] [3] [4]

  8. Binary opposition - Wikipedia

    en.wikipedia.org/wiki/Binary_opposition

    Binary opposition is the system of language and/or thought by which two theoretical opposites are strictly defined and set off against one another. [1] It is the contrast between two mutually exclusive terms, such as on and off, up and down, left and right. [ 2 ]

  9. Elementary particle - Wikipedia

    en.wikipedia.org/wiki/Elementary_particle

    Subatomic particles such as protons or neutrons, which contain two or more elementary particles, are known as composite particles. Ordinary matter is composed of atoms, themselves once thought to be indivisible elementary particles. The name atom comes from the Ancient Greek word ἄτομος which means indivisible or uncuttable.