_initial_nodes_a(n, k)
Computes an initial approximation to the square of the k-th (positive) root $x_k$
of the Hermite polynomial $H_n$
of order $n$
. The formula is the one from lemma 3.1 in the original paper. The guesses are accurate except in the region near $\sqrt{2n + 1}$
.
Square of the approximate roots
Tricomi initial guesses
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