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  • In formal mathematics, on the other hand, the ellipsis is removed and the theorem is expressed through a different abstraction marker: the sign for summatories ∑, but even using this sign some ambiguity will remain...

    --Luis A. Pineda, 2002, in Lorenzo Magnani, Nancy J. Nersessian, Claudio Pizzi (eds.), Logical and Computational Aspects of Model-Based Reasoning, p. 84.

    March 19, 2008

  • Other possible usage:

    "Lady Thatcher addressed the Summatories at the party's leadership convention in Brighton last weekend".

    March 20, 2008

  • Interesting, I've always referred to sigma as the "Summation sign". Of course, in Latex it is just \Sum.

    March 20, 2008