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  2. Quotient group - Wikipedia

    en.wikipedia.org/wiki/Quotient_group

    The quotient group is the same idea, although one ends up with a group for a final answer instead of a number because groups have more structure than an arbitrary collection of objects: in the quotient ⁠ / ⁠, the group structure is used to form a natural "regrouping".

  3. Ratio distribution - Wikipedia

    en.wikipedia.org/wiki/Ratio_distribution

    A ratio distribution (also known as a quotient distribution) is a probability distribution constructed as the distribution of the ratio of random variables having two other known distributions. Given two (usually independent ) random variables X and Y , the distribution of the random variable Z that is formed as the ratio Z = X / Y is a ratio ...

  4. x̅ and R chart - Wikipedia

    en.wikipedia.org/wiki/X̅_and_R_chart

    In statistical process control (SPC), the ¯ and R chart is a type of scheme, popularly known as control chart, used to monitor the mean and range of a normally distributed variables simultaneously, when samples are collected at regular intervals from a business or industrial process. [1]

  5. Glossary of group theory - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_group_theory

    quotient group Given a group G and a normal subgroup N of G, the quotient group is the set G / N of left cosets {aN : a ∈ G} together with the operation aN • bN = abN. The relationship between normal subgroups, homomorphisms, and factor groups is summed up in the fundamental theorem on homomorphisms.

  6. Grouped data - Wikipedia

    en.wikipedia.org/wiki/Grouped_data

    The students may be 10 years old, 11 years old or 12 years old. These are the age groups, 10, 11, and 12. Note that the students in age group 10 are from 10 years and 0 days, to 10 years and 364 days old, and their average age is 10.5 years old if we look at age in a continuous scale. The grouped data looks like:

  7. Presentation of a group - Wikipedia

    en.wikipedia.org/wiki/Presentation_of_a_group

    This has the intuitive meaning that the images of x and y are supposed to be equal in the quotient group. Thus, for example, r n in the list of relators is equivalent with =. [1] For a finite group G, it is possible to build a presentation of G from the group multiplication table, as follows.

  8. Kazhdan's property (T) - Wikipedia

    en.wikipedia.org/wiki/Kazhdan's_property_(T)

    Property (T) is preserved under quotients: if G has property (T) and H is a quotient group of G then H has property (T). Equivalently, if a homomorphic image of a group G does not have property (T) then G itself does not have property (T). If G has property (T) then G/[G, G] is compact. Any countable discrete group with property (T) is finitely ...

  9. Lyndon–Hochschild–Serre spectral sequence - Wikipedia

    en.wikipedia.org/wiki/Lyndon–Hochschild–Serre...

    In mathematics, especially in the fields of group cohomology, homological algebra and number theory, the Lyndon spectral sequence or Hochschild–Serre spectral sequence is a spectral sequence relating the group cohomology of a normal subgroup N and the quotient group G/N to the cohomology of the total group G.