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  1. A wff whose truth values are always false, is called a _______
    by Dr. Osama M. Khaled — published Aug 15, 2022 — last modified Aug 15, 2022 11:00 AM Located in Mathematics / … / Formal Logic / Tautologies
  2. A wff whose truth values are always true, is called a ________
    by Dr. Osama M. Khaled — published Aug 14, 2022 — last modified Aug 15, 2022 06:03 AM Located in Mathematics / … / Formal Logic / Tautologies
  3. Equivalent wffs
    by Dr. Osama M. Khaled — published Aug 16, 2022 — last modified Aug 17, 2022 12:26 AM Located in Mathematics / … / Formal Logic / Tautologies
  4. Is the following an equivalent wffs?
    by Dr. Osama M. Khaled — published Aug 18, 2022 — last modified Aug 19, 2022 12:05 AM Located in Mathematics / … / Formal Logic / Tautologies
  5. Mark the following statements as tautology or contradiction
    by Dr. Osama M. Khaled — published Aug 15, 2022 — last modified Jul 03, 2025 12:29 PM Located in Mathematics / … / Formal Logic / Tautologies
  6. Some Tautological Equivalences
    by Dr. Osama M. Khaled — published Aug 18, 2022 — last modified Jul 03, 2025 12:29 PM Located in Mathematics / … / Formal Logic / Tautologies
  7. The following statement is a tautology
    by Dr. Osama M. Khaled — published Aug 14, 2022 — last modified Aug 15, 2022 06:38 AM Located in Mathematics / … / Formal Logic / Tautologies
  8. "Today the sun will shine or today the sun will not shine" is called a Tautology
    by Dr. Osama M. Khaled — published Aug 14, 2022 — last modified Aug 15, 2022 06:36 AM Located in Mathematics / … / Formal Logic / Tautologies
  9. A - B = B - A?
    by Dr. Osama M. Khaled — published Jul 12, 2022 — last modified May 29, 2025 08:34 PM Located in Mathematics / … / Sets / Elementary Set Theory - Quick Review
  10. A - B reads as
    by Dr. Osama M. Khaled — published Jul 12, 2022 — last modified May 29, 2025 08:33 PM Located in Mathematics / … / Sets / Elementary Set Theory - Quick Review
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