Put a \vspace{0.25cm} (or whatever spacing you're happy with) at the end of each of the first three lines in the array. I've attached a LyX file with your equations typeset in various ways, including the \cases AMS math environment suggested by Dekel Tsur.
Hope this helps, Johnathan
Thank you for your reply!
What I see is that the \vspace fixes the problem quite well.
The \cases environment seems to affect only the justification of the right cells of the equations, making them all left justified, ie. the same spacing after the equals signs, whereas the array env. center justifies the rightmost cells. So the \cases rendering has small fractions, but they are spaced a little bit better than with the array env. even when they are left small without using \displaysize.
Using \displaystyle in the \cases environment still results in the fractional expressions being too close vertically.
So it looks like \vspace is the winner.
Is there somewhere in the LyX documentation where \vspace is mentioned? I didn't notice it in any of the User's Guide sections on math editing.
Thanks again for your suggestions, since I have the answer I need!
Good day!
-- ____________________________________ Christopher R. Carlen Principal Laser/Optical Technologist Sandia National Laboratories CA USA [EMAIL PROTECTED]
