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  2. Wikipedia - Wikipedia

    en.wikipedia.org/wiki/Wikipedia

    LAMP platform [2] OCLC number. 52075003. Wikipedia [note 3] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki -based editing system MediaWiki.

  3. Z-Library - Wikipedia

    en.wikipedia.org/wiki/Z-Library

    Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has since expanded dramatically. [6] [7]

  4. Unitary matrix - Wikipedia

    en.wikipedia.org/wiki/Unitary_matrix

    U can be written as U = e iH, where e indicates the matrix exponential, i is the imaginary unit, and H is a Hermitian matrix. For any nonnegative integer n, the set of all n × n unitary matrices with matrix multiplication forms a group, called the unitary group U(n). Every square matrix with unit Euclidean norm is the average of two unitary ...

  5. Member states of the United Nations - Wikipedia

    en.wikipedia.org/wiki/Member_states_of_the...

    The member states of the United Nations comprise 193 sovereign states. The United Nations (UN) is the world's largest intergovernmental organization. All members have equal representation in the UN General Assembly. [3] The Charter of the United Nations defines the rules for admission of member states.

  6. United Nations - Wikipedia

    en.wikipedia.org/wiki/United_Nations

    United Nations. The United Nations ( UN) is a diplomatic and political [2] international organization whose stated purposes are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and serve as a centre for harmonizing the actions of nations. [3]

  7. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Stage 3 Chronic Kidney Disease (CKD): Symptoms and More

    www.healthline.com/health/stage-3-kidney-disease

    Stage 3 CKD indicates your kidneys have mild to moderate damage, based on lab results. At this stage, you may start to notice symptoms of CKD, including frequent urination and changes to the color ...

  9. Special unitary group - Wikipedia

    en.wikipedia.org/wiki/Special_unitary_group

    Special unitary group. In mathematics, the special unitary group of degree n, denoted SU (n), is the Lie group of n × n unitary matrices with determinant 1. The matrices of the more general unitary group may have complex determinants with absolute value 1, rather than real 1 in the special case. The group operation is matrix multiplication.