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  2. K-group - Wikipedia

    en.wikipedia.org/wiki/K-group

    A complemented group; K-gruppen (K-groups), small Communist groups in 1970s Germany This page was last edited on 2 ...

  3. K-groups of a field - Wikipedia

    en.wikipedia.org/wiki/K-groups_of_a_field

    The K-groups of finite fields are one of the few cases where the K-theory is known completely: [2] for , = (() +) {/ (), =,For n=2, this can be seen from Matsumoto's theorem, in higher degrees it was computed by Quillen in conjunction with his work on the Adams conjecture.

  4. Group (periodic table) - Wikipedia

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

    The number proceeds in a linearly increasing fashion for the most part, once on the left of the table, and once on the right (see List of oxidation states of the elements), with some irregularities in the transition metals. However, the two systems use the letters differently. For example, potassium (K) has one valence electron. Therefore, it ...

  5. Class number formula - Wikipedia

    en.wikipedia.org/wiki/Class_number_formula

    K is a number field. [K : Q] = n = r 1 + 2r 2, where r 1 denotes the number of real embeddings of K, and 2r 2 is the number of complex embeddings of K. ζ K (s) is the Dedekind zeta function of K. h K is the class number, the number of elements in the ideal class group of K. Reg K is the regulator of K. w K is the number of roots of unity ...

  6. Index of a subgroup - Wikipedia

    en.wikipedia.org/wiki/Index_of_a_subgroup

    O p (G) is the intersection of all normal subgroups K of G such that G/K is a (possibly non-abelian) p-group (i.e., K is an index normal subgroup): G/O p (G) is the largest p-group (not necessarily abelian) onto which G surjects. O p (G) is also known as the p-residual subgroup.

  7. Algebraic K-theory - Wikipedia

    en.wikipedia.org/wiki/Algebraic_K-theory

    For a commutative ring R, the group K 0 (R) is related to the Picard group of R, and when R is the ring of integers in a number field, this generalizes the classical construction of the class group. The group K 1 (R) is closely related to the group of units R ×, and if R is a field, it is exactly the group of units. For a number field F, the ...

  8. PayPal fixes outage that affected thousands worldwide - AOL

    www.aol.com/news/paypal-outage-affects-thousands...

    The company experienced a system issue that affected multiple products including account withdrawals, peer-to-peer payment service Venmo, online checkout and crypto. PayPal said the issue, which ...

  9. Complemented group - Wikipedia

    en.wikipedia.org/wiki/Complemented_group

    The Frattini subgroup of a K-group is trivial; if a group has a core-free maximal subgroup that is a K-group, then it itself is a K-group; hence subgroups of K-groups need not be K-groups, but quotient groups and direct products of K-groups are K-groups, (Schmidt 1994, pp. 115–116).