21 Table of Contents: “... with Application to General Relativity -- The Bottom of the Spectrum in a Double-Contrast Periodic Model...”

22 Table of Contents: “... Hyperbolic Systems in Fluid Dynamics -- Applications of Shock-Waves in General Relativity -- The Riemann...”

23 “..., a pendulum of variable length, and in other more general related equations is also proved...”

24 “... perturbations; and the surprising but general relation between general quantum fluctuations and boson systems...”

25 “... equations (and more general relations) which arise in differential geometry rather than in physics. Our...”