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The Pochhammer notation (a)_{k} (also called Pochhammer’s symbol) is supported by the
binary operator POCHHAMMER(A,K). For a non-negative integer k, it is defined as
(http://dlmf.nist.gov/5.2.iii)

(a)_{0} | = 1, | ||

(a)_{k} | = a(a + 1)(a + 2)(a + k - 1). | ||

For a ⁄= 0,±1,±2,…, this is equivalent to | |||

(a)_{k} | = |

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