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math.LO2024
On the downward Löwenheim-Skolem Theorem for elementary submodels
Matthias Kunik
We introduce a new definition of a model for a formal mathematical system. The definition is based upon the substitution in the formal systems, which allows a purely algebraic appr…
math-ph2024
Radially symmetric solutions of the ultra-relativistic Euler equations in several space dimensions
Matthias Kunik, Adrian Kolb, Siegfried Müller +1
The ultra-relativistic Euler equations for an ideal gas are described in terms of the pressure, the spatial part of the dimensionless four-velocity and the particle density. Radial…