Krieger, JoachimXiang, Shengquan2019-11-122019-11-122019-11-122019-11-1210.1051/cocv/2020066https://infoscience.epfl.ch/handle/20.500.14299/162876The controllability of the linearized KdV equation with right Neumann control is studied in the pioneering work of Rosier [25]. However, the proof is by contradiction arguments and the value of the observability constant remains unknown, though rich mathematical theories are built on this totally unknown constant. We introduce a constructive method that gives the quantitative value of this constant.Korteweg-de Vriescontrollabilitycostobservabilitytext::journal::journal article::research article