Fórmola dë Stiefel

Stamp:Prinsipi As ciama fórmola dë Stiefel l'ugualiansa

$\left(\begin{array}{c}n+1\\ k+1\end{array}\right)=\left(\begin{array}{c}n\\ k\end{array}\right)+\left(\begin{array}{c}n\\ k+1\end{array}\right)$.