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  1. Negation Symbol (¬)

  2. List of logic symbols - Wikipedia

  3. The "Not Sign (¬)" Symbol in Mathematics

  4. Negation - Wikipedia

  5. Symbolic Logic Introduction - Boise State University

  6. What is the logical negation symbol? - TechTarget

  7. Logical Connectives: Symbols, Meanings and Truth Tables - Flamath

  8. Negation of a Statement (Definition, Symbols and Examples)

  9. Negation - Educative

  10. Negation Sign -- from Wolfram MathWorld