Best way to insert system of equations

[Paul Smith]

Dear All,

I am trying to insert a system of equation in a LyX document. I am
using the cases environment, but, as you can see from the attached
example, the space between the first system of equations and the
equivalence symbol is too large and not symmetric regarding the
distance between the equivalence symbol and the second system of
equations. Any ideas about how to improve this?

Thanks in advance,

Paul

example_system_equations.lyx
Description: application/lyx