L. Thibault, SEQUENTIAL CONVEX SUBDIFFERENTIAL CALCULUS AND SEQUENTIAL LAGRANGE MULTIPLIERS, SIAM journal on control and optimization, 35(4), 1997, pp. 1434-1444
The aim of this paper is to establish formulas for the subdifferential
s of the sum and the composition of convex functions in terms of the s
ubdifferentials of the data functions at nearby points. Applications t
o general optimization problems lead to a new notion of sequential Lag
range multipliers.