Table 1 Vector notation summary for the general design and maintenance problemin time- variant reliability: with the randomvectors in the top half and the decisions to take (deterministic vectors) in the bottom half.
Notation Vector space Description Xðt;πÞ Rn State (random vector) at the discrete date t WðtÞ Rp ðprnÞ Effect of the stochastic processes between t and tþ1 W ðRpÞT Scenario, sequence ðWð0Þ;Wð1Þ;…;WðT1ÞÞ πΠ Design (or design choice): fixed u Uðt;xÞRq Control (decision): fixed uðÞ UðTÞ Strategy (control sequence)