Robuta

https://www.nber.org/papers/t0055 A Simple, Positive Semi-Definite, Heteroskedasticity and AutocorrelationConsistent Covariance... Founded in 1920, the NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings... positive semi definite simple heteroskedasticity covariance https://arxiv.org/abs/2505.04514 [2505.04514] Quantum thermodynamics and semi-definite optimization Abstract page for arXiv paper 2505.04514: Quantum thermodynamics and semi-definite optimization quantum thermodynamics semi definite 2505 04514 optimization