Contradiction: Definition, Conditions and Application to Propositions

Read-only question overview. Answers and scoring remain inside authenticated learner attempts.

• What relation is necessary for contradiction?
• Why are “This cloth is white” and “This cloth is black” not necessarily contradictory?
• With all qualifications fixed, what exactly contradicts “Zayd is standing”?
• Which identity fails between “Zayd stands” and “Amr does not stand”?
• Why do “Zayd is sitting” and “Zayd is not standing” fail to contradict?
• Why can “Zayd is at home” and “Zayd is not in the market” both be true?
• What condition fails between morning presence and evening absence?
• Which identity distinguishes a seed’s capacity to become a tree from its actually being a tree?
• Why do finger movement while writing and non-movement while not writing not contradict?
• Which identity fails in “Zayd is Bakr’s father” and “Zayd is not Khalid’s father”?
• What must be clarified first in comparing “the whole body is black” and “the teeth are not black”?
• How do some commentators subsume the eight identities under subject and predicate?
• What is meant by identity of the predicative relation?
• What is the exact contradictory of a universal affirmative?
• What contradicts “No human is an animal”?
• Why are “All animals are human” and “No animals are human” not contradictories?
• Why are “Some animals are human” and “Some animals are not human” not contradictories?
• Which exactly negates “Every student is present”?
• Why must modal contradictories account for something additional?
• What does “This judgment is not necessary” NOT imply?
• Which correctly contradicts “The door is always closed”?
• What does the textbook require for contradictory conditionals?
• Which statement does NOT negate “If it rains, the ground will be wet”?
• What is the logical status of merely saying “The number is not even” against “The number is even or odd”?
• What suffices to refute a conditional claimed to hold “every time”?
• How is quantity treated when negating “This book is new”?
• What suffices to reject a combined modal claim “both necessary and permanent”?
• What should be negated in the universal conditional “Whenever the teacher comes, the lesson starts”?
• At the same time and in the same respect, “This pen exists” and “This pen does not exist” can be contradictories.
• “No flower is red” is the exact contradictory of “Every flower is red.”
• When propositions concern different times, affirmation and negation alone do not guarantee contradiction.
• Negating the antecedent of a conditional necessarily negates the entire conditional.