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The fidelity between two quantum states and , expressed as density matrices, is commonly defined as: [1] [2] (,) = ().The square roots in this expression are well-defined because both and are positive semidefinite matrices, and the square root of a positive semidefinite matrix is defined via the spectral theorem.
Share of the American Express Company, 1865. In 1850, American Express was started as a freight forwarding company in Buffalo, New York. [13] It was founded as a joint-stock corporation by the merger of the cash-in-transit companies owned by Henry Wells (Wells & Company), William G. Fargo (Livingston, Fargo & Company), and John Warren Butterfield (Wells, Butterfield & Company, the successor ...
USF&G was an American insurance company that existed from 1896 [1] until 1998. It was originally called the United States Fidelity and Guaranty Company.The insurer formed a holding company for its insurance businesses and changed its name to USF&G in July 1981.
The Charles Schwab Corporation [2] is an American multinational financial services company.It offers banking, commercial banking, investing and related services including consulting, and wealth management advisory services to both retail and institutional clients.
Fides embodies everything that is required for "honour and credibility, from fidelity in marriage, to contractual arrangements, and the obligation soldiers owed to Rome." [ 4 ] Fides also means reliability, "reliability between two parties, which is always reciprocal."
Peter Lynch (born January 19, 1944) [1] is an American investor, mutual fund manager, author and philanthropist.As the manager of the Magellan Fund [2] at Fidelity Investments between 1977 and 1990, Lynch averaged a 29.2% annual return, [3] consistently more than double the S&P 500 stock market index and making it the best-performing mutual fund in the world.