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Re: MetaMathematica

Cca wrote:

> I'm in need of a "neutral" sign for indicating that two Mathematica expressions are equivalent (in the sense that they have the same value). For this purpose, I recently started using Equilibrium. For example:
> expr[[n1,n2]]\[Equilibrium]Part[expr,n1,n2]
> Part[expr,n1,n2]\[Equilibrium]Part[Part[expr,n1],n2]
> Would anyone like to offer a suggestion for such a sign?

What about "<=>" or "<==>", that is \[DoubleLeftRightArrow]
(esc<=>esc) or \[DoubleLongLeftRightArrow] (esc<==>esc):

   DoubleLeftRightArrow[a, b]

   DoubleLongLeftRightArrow[a, b]

-- Jean-Marc

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