Equivalence after extension and Schur coupling do not coincide, on essentially incomparable Banach spaces

Sanne ter Horst, Miek Messerschmidt, Andre C. M. Ran +1

In 1994 H. Bart and V.É. Tsekanovskii posed the question whether the Banach space operator relations matricial coupling (MC), equivalence after extension (EAE) and Schur coupling (…