[Haskell-cafe] Is there a name for this property: x + x - x == x

[Roman Cheplyaka]

* Omari Norman <omari at smileystation.com> [2014-06-04 10:34:22-0400]
> It's not quite idempotence, because more than one function is involved.
> 
> It's a common property and I figure I can write a higher order function to
> build QuickCheck tests for it.  I was just wondering if it has a name.

This is similar to the inverse semigroup definition (but note the different
order of the operands).
https://en.wikipedia.org/wiki/Inverse_semigroup

Roman
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