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  2. Multi-index notation - Wikipedia

    en.wikipedia.org/wiki/Multi-index_notation

    An n-dimensional multi-index is an -tuple = (,, …,) of non-negative integers (i.e. an element of the -dimensional set of natural numbers, denoted ).. For multi ...

  3. Group by (SQL) - Wikipedia

    en.wikipedia.org/wiki/Group_by_(SQL)

    A GROUP BY statement in SQL specifies that a SQL SELECT statement partitions result rows into groups, based on their values in one or several columns. Typically, grouping is used to apply some sort of aggregate function for each group.

  4. John W. Thompson - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/john-w-thompson

    From January 2008 to December 2012, if you bought shares in companies when John W. Thompson joined the board, and sold them when he left, you would have a 1.1 percent return on your investment, compared to a -2.8 percent return from the S&P 500.

  5. Alpha–beta transformation - Wikipedia

    en.wikipedia.org/wiki/Alpha–beta_transformation

    In electrical engineering, the alpha-beta transformation (also known as the Clarke transformation) is a mathematical transformation employed to simplify the analysis of three-phase circuits.