Talk:Summation chart

Math Code

Proposed math code, please check/correct:

n = trunc[ 1-σ + sqrt[(σ-1)^2+2r] ]

$\mathrm {n=\left\lfloor 1-\sigma +{\sqrt {(\sigma -1)^{2}+2r)}}\right\rfloor }$

r = (n/2)(n+2σ-1)

$\mathrm {r=\left({\frac {n^{2}+2n\sigma -n}{2}}\right)}$

or

$\mathrm {r={\frac {n^{2}-n}{2}}+n\sigma }$

σ = (1/2)(1+2r/n-n)

$\mathrm {\sigma ={\frac {1}{2}}+{\frac {r}{n}}-{\frac {n}{2}}}$

or

$\mathrm {\sigma ={\frac {1-n}{2}}+{\frac {r}{n}}}$

Obviously I didn't go for a direct translation, I tried to do some math. I'm sure it can be improved. VANKRASN39 (talk) 17:52, 4 October 2016 (CDT)

or

$\mathrm {r={\frac {1}{2}}{\Big (}n^{2}+2n\sigma -n{\Big )}}$

DAID (talk) 17:00, 5 October 2016 (CDT)