Recht-Ré conjecture with norms inside the sums
Let be positive semidefinite matrices, and let denote the matrix norm used in the conjecture. For ordered products of length , distinguish sums over all index tuples from sums over tuples with distinct indices. Norm-sum Recht-Ré conjecture.
This is a related conjecture attributed to Recht and Ré, with the norms taken termwise rather than after summation. The source does not state whether it has been resolved.
References
Primary source
Zehua Lai and Lek-Heng Lim, “Recht-Ré Noncommutative Arithmetic-Geometric Mean Conjecture is False”, arXiv:2006.01510 (2020).
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