T(n)=n(n+1)/2
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Revision as of 01:20, 30 May 2017 by Tom (talk | contribs) (Created page with "==Theorem== The following formula holds for all $n=1,2,3,\ldots$: $$T(n)=\dfrac{n(n+1)}{2},$$ where $T$ denotes triangular numbers. ==Proof== ==References== * {{PaperRef...")
Theorem
The following formula holds for all $n=1,2,3,\ldots$: $$T(n)=\dfrac{n(n+1)}{2},$$ where $T$ denotes triangular numbers.
