For a class of repetitive linear discrete-time-invariant systems with the unit relative degree. a learning-gain-adaptive iterative learning control (LGAILC) mechanism is exploited. for which the iteration-wise performance index is to maximize the declining quantity of tracking-error energies at two adjacent operations without considering control input and any parameters. and the argum... https://www.marcelovicente.com/product-category/hair-loss-concealer/