513 prompts matching "Sigma notation for a sum"
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Quiz: A cubic with three distinct real roots
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Practice: A cubic with one real root and two complex ones
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Spot My Mistake: Finding the remaining roots once one is known
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Worked Example: Sentences that are not propositions
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Quiz: The truth value of a simple proposition
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Practice: The conjunction of two propositions
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Spot My Mistake: The negation of a proposition
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Worked Example: Conjunction in a three-variable truth table
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Quiz: Disjunction and the inclusive or
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Practice: Negation combined with a compound statement
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Spot My Mistake: Building a truth table column by column
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Quiz: Why a conditional with a false antecedent counts as true
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Practice: The converse of a conditional
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Spot My Mistake: The contrapositive of a conditional
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Quiz: The biconditional as two conditionals taken together
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Practice: What logical equivalence means
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Spot My Mistake: De Morgan's laws in logic
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Worked Example: What a contradiction is
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Quiz: What a contingency is
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Practice: Showing that a statement is a tautology
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