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  2. Empty sum - Wikipedia

    en.wikipedia.org/wiki/Empty_sum

    In mathematics, an empty sum, or nullary sum, [1] is a summation where the number of terms is zero. The natural way to extend non-empty sums [ 2 ] is to let the empty sum be the additive identity . Let a 1 {\displaystyle a_{1}} , a 2 {\displaystyle a_{2}} , a 3 {\displaystyle a_{3}} , ... be a sequence of numbers, and let

  3. Subset sum problem - Wikipedia

    en.wikipedia.org/wiki/Subset_sum_problem

    Whenever the sum of the current element in the first array and the current element in the second array is more than T, the algorithm moves to the next element in the first array. If it is less than T, the algorithm moves to the next element in the second array. If two elements that sum to T are found, it stops. (The sub-problem for two elements ...

  4. Empty product - Wikipedia

    en.wikipedia.org/wiki/Empty_product

    In mathematics, an empty product, or nullary product or vacuous product, is the result of multiplying no factors.It is by convention equal to the multiplicative identity (assuming there is an identity for the multiplication operation in question), just as the empty sum—the result of adding no numbers—is by convention zero, or the additive identity.

  5. Summation - Wikipedia

    en.wikipedia.org/wiki/Summation

    In mathematics, summation is the addition of a sequence of numbers, called addends or summands; the result is their sum or total.Beside numbers, other types of values can be summed as well: functions, vectors, matrices, polynomials and, in general, elements of any type of mathematical objects on which an operation denoted "+" is defined.

  6. Sumset - Wikipedia

    en.wikipedia.org/wiki/Sumset

    where is the set of square numbers. A subject that has received a fair amount of study is that of sets with small doubling , where the size of the set A + A {\displaystyle A+A} is small (compared to the size of A {\displaystyle A} ); see for example Freiman's theorem .

  7. Restore deleted or missing contacts in AOL Mail

    help.aol.com/articles/restore-deleted-or-missing...

    If you've deleted your contacts or are suddenly missing some, don't worry! Contacts can be restored to automatic save points in time. WARNING: The restore will replace any changes or additions made to your contacts since that time. 1. Click Contacts from the left panel in AOL Mail. 2. Click More | Restore. 3.

  8. 4 of the Top Prescription Weight Loss Pills & How They Work - AOL

    www.aol.com/4-top-prescription-weight-loss...

    Top Prescription Weight Loss Pills. Anti-obesity medications (AOMs) date back to the 1940s — well before modern regulations from the FDA (U.S. Food and Drug Administration) (FDA) were in place ...

  9. Zeckendorf's theorem - Wikipedia

    en.wikipedia.org/wiki/Zeckendorf's_theorem

    Now take two non-empty sets and of distinct non-consecutive Fibonacci numbers which have the same sum, =. Consider sets S ′ {\displaystyle S'} and T ′ {\displaystyle T'} which are equal to S {\displaystyle S} and T {\displaystyle T} from which the common elements have been removed (i. e. S ′ = S ∖ T {\displaystyle S'=S\setminus T} and T ...