I'm looking for a source to cite. I'm working on mathematical expressions that re-use the same subexpression multiple times. Intuitively someone reading such an expression only needs to understand a subexpression that is re-used once and can then apply this knowledge multiple times. In computers one could cache the output of a re-used subexpression and then call the cache whenever the same subexpression is queried again instead of recalculating the whole subexpression.
I'm sure something similar happens in the human brain, or at least this is how I read mathematical expressions myself, but I'm unable to find a source because I lack the terminology. Could someone help me out?