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2. Double factorial - Wikipedia

   en.wikipedia.org/wiki/Double_factorial

   These are counted by the double factorial 15 = (6 − 1)‼. In mathematics, the double factorial of a number n, denoted by n‼, is the product of all the positive integers up to n that have the same parity (odd or even) as n. [1] That is,

3. List of integrals of Gaussian functions - Wikipedia

   en.wikipedia.org/wiki/List_of_integrals_of...

   In the previous two integrals, n!! is the double factorial: for even n it is equal to the product of all even numbers from 2 to n, and for odd n it is the product of all odd numbers from 1 to n; additionally it is assumed that 0!! = (−1)!! = 1.

4. Eulerian number - Wikipedia

   en.wikipedia.org/wiki/Eulerian_number

   The permutations of the multiset {,,,, …,,} which have the property that for each k, all the numbers appearing between the two occurrences of k in the permutation are greater than k are counted by the double factorial number ()!!.

5. Factorial - Wikipedia

   en.wikipedia.org/wiki/Factorial

   In mathematics, the factorial of a non-negative integer, denoted by !, is the product of all positive integers less than or equal to . The factorial of also equals the product of with the next smaller factorial: ! = () = ()! For example, ! =! = =

6. List of logic symbols - Wikipedia

   en.wikipedia.org/wiki/List_of_logic_symbols

   In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.

7. Red food dye could soon be banned as FDA reviews petition ...

   www.aol.com/red-food-dye-could-soon-181649897.html

   A widely used artificial food dye could soon be outlawed. The U.S. Food and Drug Administration (FDA) is moving to ban an artificial food coloring called Red No. 3, also known as Erythrosine. The ...