  We give a derivation for the value of inf-sup constant for the bilinear form
(p, div u). We prove that the value of inf-sup constant is equal to 1.0 in all
cases and is independent of the size and shape of the domain. Numerical tests
for validation of inf-sup constants is performed using finite dimensional
spaces defined in \cite{2020jain} on two test domains i) a square of size
$\Omega = [0,1]^2$, ii) a square of size $\Omega = [0,2]^2$, for varying mesh
sizes and polynomial degrees. The numeric values are in agreement with the
theoretical value of inf-sup term.
