On 26.04.2022 11:13, Kristofer Munsterhjelm wrote: > The derivative wrt v_1 is > v_1 = ( -R_1/(lambda*p) )^(1/(p-1)) > and wrt lambda > sum i=1..n: v_i^p = 1. This should of course be "the derivative wrt v_1 is zero when..." and "wrt lambda is zero when..." - I skipped a step! -km