Sunday, 21 May 2017

notation - Is there a standard name or shorthand for "plustorial"?








We're all familiar with factorial:
n>0,n!=n×(n1)××(n(n1))



I've occasionally seen "plustorial":
n>0,n(plustorial)=n+(n1)++(n(n1))



Some quick web searching indicates that there is some non-standard but somewhat common usage of the term "plustorial" to describe this, with shorthand being a double-dagger or an exclaimation point having a "+" rather than a dot beneath the vertical mark.




My question is: Is there a "real" standard name for this process and is there a standard corresponding shorthand? I understand that it could be written in sigma notation, was curious about something more terse.

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