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  2. Quaternion group - Wikipedia

    en.wikipedia.org/wiki/Quaternion_group

    Each color specifies a series of powers of any element connected to the identity element e = 1. For example, the cycle in red reflects the fact that i 2 = e , i 3 = i and i 4 = e. The red cycle also reflects that i 2 = e , i 3 = i and i 4 = e.

  3. Group (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Group_(mathematics)

    The manipulations of the Rubik's Cube form the Rubik's Cube group.. In mathematics, a group is a set with an operation that associates an element of the set to every pair of elements of the set (as does every binary operation) and satisfies the following constraints: the operation is associative, it has an identity element, and every element of the set has an inverse element.

  4. Circle group - Wikipedia

    en.wikipedia.org/wiki/Circle_group

    The structure theorem for divisible groups and the axiom of choice together tell us that is isomorphic to the direct sum of / with a number of copies of ⁠ ⁠. [ 2 ] The number of copies of ⁠ Q {\displaystyle \mathbb {Q} } ⁠ must be c {\displaystyle {\mathfrak {c}}} (the cardinality of the continuum ) in order for the cardinality of the ...

  5. Multiplicative group - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_group

    The group scheme of n-th roots of unity is by definition the kernel of the n-power map on the multiplicative group GL(1), considered as a group scheme.That is, for any integer n > 1 we can consider the morphism on the multiplicative group that takes n-th powers, and take an appropriate fiber product of schemes, with the morphism e that serves as the identity.

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    The multiplication of whole numbers may be thought of as repeated addition; that is, the multiplication of two numbers is equivalent to adding as many copies of one of them, the multiplicand, as the quantity of the other one, the multiplier; both numbers can be referred to as factors.

  7. Multiplicative group of integers modulo n - Wikipedia

    en.wikipedia.org/wiki/Multiplicative_group_of...

    Integer multiplication respects the congruence classes, that is, a ≡ a' and b ≡ b' (mod n) implies ab ≡ a'b' (mod n). This implies that the multiplication is associative, commutative, and that the class of 1 is the unique multiplicative identity. Finally, given a, the multiplicative inverse of a modulo n is an integer x satisfying ax ≡ ...

  8. Elementary mathematics - Wikipedia

    en.wikipedia.org/wiki/Elementary_mathematics

    Rational number is any number that can be expressed as the quotient or fraction p/q of two integers, with the denominator q not equal to zero. [9] Since q may be equal to 1, every integer is a rational number. The set of all rational numbers is usually denoted by a boldface Q (or blackboard bold).

  9. Prüfer group - Wikipedia

    en.wikipedia.org/wiki/Prüfer_group

    (where Z[1/p] denotes the group of all rational numbers whose denominator is a power of p, using addition of rational numbers as group operation). For each natural number n, consider the quotient group Z/p n Z and the embedding Z/p n Z → Z/p n+1 Z induced by multiplication by p. The direct limit of this system is Z(p ∞):

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