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Mathematica

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  • $\begingroup$ The form +## rates highly on my weirdo meter. Weirdo. BTW, +1. :) $\endgroup$ Commented Sep 6, 2013 at 17:16
  • 1
    $\begingroup$ @rcollyer Yes, it's a favorite of mine, thank-you-very-much. :D $\endgroup$ Commented Sep 6, 2013 at 17:21
  • $\begingroup$ Great! Your solution is very compact and can be generalized to any numbers of terms, +1 :) $\endgroup$ Commented Sep 6, 2013 at 17:33
  • $\begingroup$ @ybeltukov I'm glad you appreciate it. Thanks for the vote. $\endgroup$ Commented Sep 6, 2013 at 17:37
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    $\begingroup$ @Blackbird It is not directly documented that I know of, but it comes from an understanding of Mathematica's parsing. +x parses as Plus[x] as can be seen with Hold[+x] // FullForm. So +## is Plus[##] and then it's just a matter of SlotSequence which is directly documented. As a second example 1 x parses as Times[1, x] so we can use 1 ## as shorthand for multiplying arguments. $\endgroup$ Commented Sep 6, 2013 at 18:22