Hi all,
Let's assume we have two float arrays, `x0` and `h`, both of which have the
same shape. Let's calculate the sum of those two arrays:

```
x1 = x0 + h
```

The true representable difference between `x1` and `x0` is:

```
dx = x1 - x0
```

Is it also possible to get that exact representation by doing the following:

```
dx = (x0 + h) - x0
```

Or is there a risk that the Python interpreter would prematurely optimize
that to give:

```
dx = h
```


-- 
_____________________________________
Dr. Andrew Nelson


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