[[math]] A = \pi \cdot r^2 [[/math]]
[[math]]
C = 2\pi r
[[/math]]
[[math quadratic-formula]]
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
[[/math]]
[[math navier-stokes]]
\frac{\mathrm{D} \mathbf{u}}{\mathrm{D} t} =
\frac 1 \rho \nabla \cdot \boldsymbol{\sigma} + \mathbf{f}.
[[/math]]
Apple[[eref quadratic-formula]]
Banana cherry[[equation quadratic-formula]] Gooseberry
Pineapple[[eref navier-stokes]]Blueberry
**FAIL**
EMPTY
[[math]]
[[/math]]
Durian[[eref]]