Thank you for pointing this out. This is the code block which includes the
first appearance of the keyword `logical_not`.
BTW, why can't the ~ operator be tested equal to 'np.invert', as shown below:
```
In [1]: import numpy as np
In [3]: np.invert is np.bitwise_not
Out[3]: True
In [4]: np.invert is ~
File "<ipython-input-4-32abf1603b17>", line 1
np.invert is ~
^
SyntaxError: invalid syntax
```
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