Numerical algorithm based on two discrete singular value problems with Lagrange finite elements and flux reconstruction error estimators yields a lower bound on the inf-sup constant that underestimates the true value by a factor of roughly two when the discretization is sufficiently rich.
Comp.89(2021), 551–594
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Guaranteed stability bounds for second-order PDE problems satisfying a Garding inequality
Numerical algorithm based on two discrete singular value problems with Lagrange finite elements and flux reconstruction error estimators yields a lower bound on the inf-sup constant that underestimates the true value by a factor of roughly two when the discretization is sufficiently rich.