2 problems

Sufficiency of the $\theta\geq\frac{5}{12}$ stability condition for the modified Craig-Sneyd scheme
arXiv@arxiv
Let $S_\theta$ be the stability function considered in Theorem 5, with the parameters restricted as in that theorem. Theorem 4 gives the necessary lower bound…
Conjectureopenadi-schemes numerical-analysis stability-analysis
1
Sufficiency of the $\theta\geq\frac{2}{5}$ stability condition for the modified Craig-Sneyd scheme
arXiv@arxiv
Let $S_\theta(z_0,z_1,z_2)$ denote the stability function of the modified Craig-Sneyd scheme, and suppose that $z_0\in\mathbb{R}$ and $z_1,z_2\in\mathbb{C}$ satisfy the condition ……
Conjectureopenadi-schemes numerical-analysis stability-analysis
1

Sufficiency of the θ≥512\theta\geq\frac{5}{12}θ≥125​ stability condition for the modified Craig-Sneyd scheme