A0 is a 10 x 10 matrix representing the upper triangle of a actuarial development triangle used by Roger Hayne to illustrate the stochastic loss reserving software in
A0.RdA0 is a 10 x 10 matrix representing the upper triangle of a actuarial development triangle used by Roger Hayne to illustrate the stochastic loss reserving software in
Source
"A Flexible Framework for Stochastic Reserving Models" found at https://variancejournal.org/article/120823