Boole
 Usage
• Boole[expr] yields 1 if expr is True and 0 if it is False.
Notes
• Boole[expr] remains unchanged if expr is neither True nor False. • Boole[expr] is effectively equivalent to If[expr, 1, 0]. • Integrate[f Boole[pred], ... ] can be used to integrate f over the region in which pred is True. • New in Version 5.1.
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