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    $\begingroup$ If you look at Mr.Wizard's answer here, and the linked post, the prospects for doing what you want seem to be rather dim. $\endgroup$ Commented Feb 15, 2015 at 5:11
  • $\begingroup$ @Jens: I had seen the statement that compound operators cannot have custom precedence, but I wondered if an existing operator (plus, minus, times, etc) might retain its precedence if used with a subscript. I have experimented but am not very proficient at defining notations and so far can't get a subscripted operator to call a function at all, whereas I was able to get non-subscripted custom operators like !*! to do so. $\endgroup$ Commented Feb 15, 2015 at 15:21
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    $\begingroup$ @Duns I believe you are looking for this: (39703). I cannot recall with certainty what the precedence of the "new" operators is and I don't have time to experiment, but I think it tracks the "parent" operator. Please test that and let me know if it will suit your needs. $\endgroup$ Commented Feb 15, 2015 at 17:01