# Mathematica symbolic question - Subexpressions?

Apologies in advance if this has been asked but I cannot find any information.

I'm calculating the determinant of a large symbolic polynomial matrix. In the result are symbols such as this:

as in this (partial result):

Are these symbols common subexpressions? If so, is there a way to determine the subexpression without expanding all of them?

Thanks!

• "Are these symbols common subexpressions?" - no, just Mathematica helpfully eliding subexpressions that are normally too complicated to display. – J. M.'s ennui Mar 17 '19 at 20:47
• Is there an (easy) way to determine the definition of the subexpression? – wdmichael Mar 17 '19 at 22:25
• @wdmichael store the result in a variable and use the [[...]] syntax to extract parts – b3m2a1 Mar 18 '19 at 5:24
• Thank you! This is very helpful. – wdmichael Mar 18 '19 at 13:23