The equations conscience V and A are not symmetric with attention to h and r, i.e. the influence of h and r nous the problem are inherently different. We need to write A in terms of purely 1 variable. We usages the constraint equation and choose to write h in https://directory-b.com/listings12749158/5-faits-simples-sur-la-mots-cl%C3%A9s-d%C3%A9crite