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Asked: 2026-05-19T10:30:19+00:00

My code relies on version of Element which works like MemberQ , but when

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My code relies on version of Element which works like MemberQ, but when I load Combinatorica, Element gets redefined to work like Part. What is the easiest way to fix this conflict? Specifically, what is the syntax to remove Combinatorica’s definition from DownValues? Here’s what I get for DownValues[Element]

{HoldPattern[
   Combinatorica`Private`a_List \[Element] \
{Combinatorica`Private`index___}] :> 
  Combinatorica`Private`a[[Combinatorica`Private`index]], 
 HoldPattern[Private`x_ \[Element] Private`list_List] :> 
  MemberQ[Private`list, Private`x]}
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1 Answer

  1. Editorial Team

    If your goal is to prevent Combinatorica from installing the definition in the first place, you can achieve this result by loading the package for the first time thus:

    Block[{Element}, Needs["Combinatorica`"]]

    However, this will almost certainly make any Combinatorica features that depend upon the definition fail (which may or may not be of concern in your particular application).

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