I want to define boolean function in my latex document but can't find the symbol I'm looking for. My function gets an input of A and renders a true or false value to it. I have added an image to make it clear. I am looking for the symbol L 
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\mathbb{L}(amsfontspackage) – David Carlisle Jan 11 '17 at 20:21amsfontsusing\mathbb. – Werner Jan 11 '17 at 20:51