2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35449This is the reply given at the conference ``Mach's Principle" at Tübingen in July 1993 to the paper by Isenberg (1993a). Unfortunately the Isenberg paper itself was not submitted to gr-qc.4 pages, TEX, UMD94-52General Relativity and Quantum Cosmologytext