wnoise comments on Decoherence is Simple - Less Wrong
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I'm stuck, what does ~ denote?
Y and ~Y, where ~Y does read as ... ?
"Not Y".
The prefix tilde, "~", is commonly used as an ASCII approximation for logical negation, in place of the more mathematically formal notation of "¬" (U+00AC, HTML entity "¬", and latex "\lnot") . On that page are a few other common notations.