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In Lyx, when I have a long equation in display mode I would like to display it over several lines for readability. But whenever I try to do that Lyx gives me an empty table. Is there some tex command I can insert into my equation to force a line split?

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    You can use the split environment within the equation and make new lines with \\ Mar 29, 2016 at 3:39

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There's a lot about this in Help>Math, Long Formulas. Use, for example, Insert>Math>Eqnarray and add additional rows by pressing Ctrl-Enter, or Edit>Math>Add Line. In some cases you'll need Insert>Math>AMS multiline, and similar. This wiki page has a nice summary of these environments https://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics

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    please! not eqnarray! there must be some other possibilities like align or gather. Mar 29, 2016 at 12:50
  • Sure there are. Insert>Math>AMS align/alignat/flalign/gather/multiline are all there. @Betty will have to choose what's right for her. Mar 29, 2016 at 13:51
  • PhilipPirrip -- found a good solution in your reference.
    – Betty Mock
    Mar 29, 2016 at 15:27
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Insert -> Math-> AMS Multiline Environment

write your equation and click 'Ctrl+Enter' where you want to split Then Right click the equation and select number whole formula

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