Toeplitz 1911 -remains unsolved to this day

This question was asked by Toeplitz in 1911 and remains unsolved to this day

Δημοσιεύτηκε από Fermat's Library στις Σάββατο, 23 Φεβρουαρίου 2019

This question was asked by Toeplitz in 1911 and remains unsolved to this day