Pochhammerin
Pochhammerin is not a standard term in mathematics. In most literature the related term Pochhammer or Pochhammer symbol is used to denote the rising factorial. The form “Pochhammerin” may appear as a misspelling, a possessive-style rendering in some languages, or an informal designation without a formal definition.
The Pochhammer symbol, often written as (a)_n, represents the rising factorial. For a complex number a and
Several properties follow from this definition. The sequence satisfies the recurrence (a)_{n+1} = (a+n)(a)_n. It extends to
Applications of the rising factorial appear in series expansions, notably in hypergeometric functions such as 2F1,
Etymology: the symbol is named after Leopold Pochhammer, a 19th-century German mathematician. In German texts the