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Comment by saagarjha

4 days ago

The idea here is that x <= X, y <= Y, but x' + y' <= Z where x' and y' may be (individually) greater than x or y

Sure, but how do you prove that you won't end up with `x' + y' > Z` for some value of x' and y'? In practice, it's always easier to prove `x < X, y < Y`.

  • Generally the idea is that all of these are (more or less) easy to prove but the other policy allows for x' and y' to be independent