[436] Nonlinear eigenvalue problems

[437] On the solvability of the diophantine equation$ax$^{2}+$by$^{2}+$cz$^{2}=0 in imaginary Euclidean quadratic fields

[438] Spaces of distributions of Besov type on Euclidean$n$-space. Duality, interpolation

[439] Subellipticity of the $$\bar \partial$$ -Neumann problem on pseudo-convex domains: Sufficient conditionsproblem on pseudo-convex domains: Sufficient conditions

[440] Viscosity solutions of fully nonlinear second-order equations and optimal stochastic control in infinite dimensions. Part I: the case of bounded stochastic evolutions