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  2. Totally real number field - Wikipedia

    en.wikipedia.org/wiki/Totally_real_number_field

    The number field Q(√2) sits inside R, and the two embeddings of the field into C send every element in the field to another element of R, hence the field is totally real. In number theory, a number field F is called totally real if for each embedding of F into the complex numbers the image lies inside the real numbers.

  3. APL syntax and symbols - Wikipedia

    en.wikipedia.org/wiki/APL_syntax_and_symbols

    Take Pascal's triangle, which is a triangular array of numbers in which those at the ends of the rows are 1 and each of the other numbers is the sum of the nearest two numbers in the row just above it (the apex, 1, being at the top). The following is an APL one-liner function to visually depict Pascal's triangle:

  4. Class field theory - Wikipedia

    en.wikipedia.org/wiki/Class_field_theory

    In modern mathematical language, class field theory (CFT) can be formulated as follows. Consider the maximal abelian extension A of a local or global field K.It is of infinite degree over K; the Galois group G of A over K is an infinite profinite group, so a compact topological group, and it is abelian.

  5. Recorder (musical instrument) - Wikipedia

    en.wikipedia.org/wiki/Recorder_(musical_instrument)

    As the number of nodes in the tube increases, the number of notes a player can produce in a given register decreases because of the physical constraint of the spacing of the nodes in the bore. On a Baroque recorder, the first, second, and third registers span about a major ninth, a major sixth, and a minor third respectively.

  6. Rich Communication Services - Wikipedia

    en.wikipedia.org/wiki/Rich_Communication_Services

    An RCS thread on Xiaomi's messaging client, showing emojis, images, location, and a file, sent by the user. Samsung Electronics was one of the first major device original equipment manufacturers (OEMs) to support the RCS initiative and it commercially launched RCS capable devices in Europe in 2012 and in the United States in 2015.