Riemann invariants are constant along the characteristic curves of the partial differential equations where they obtain the name invariant.
Bernhard Riemann | Riemann zeta function | Riemann surface | Riemann hypothesis | Invariant theory | Riemann sphere | Riemann solver | Riemann-Roch theorem | Hugo Riemann | Taubes's Gromov invariant | Rost invariant | Riemann Xi function | Riemann's function | Riemann's existence theorem | Riemann–Roch theorem | Riemann manifold | Riemann integral | Riemann | Loop-invariant code motion | invariant theory | Generalized Riemann Hypothesis | Fritz Riemann |