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The limit-state function is defined by: $$ f(x) = b - x_2 - \kappa*(x_1-e)^2 $$ with \(b = 5\), \(\kappa = 0.5\) and \(e = 0.1\).
kiureghian
The function can handle a vector or matrix with column vectors.
Der Kiureghian, A and Dakessian, T: Multiple design points in first and second-order reliability Structural Safety, 20, 1, 37-49, 1998.