1,045 prompts matching "The imaginary unit i, and why i squared is minus one"
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Explain Back: Finding a coefficient so that a stated expression is a factor
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Practice: A cubic with one real root and two complex ones
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Final Revision: Checking a root of a cubic by substitution
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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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Final Revision: A compound proposition built from three simple ones
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Spot My Mistake: Building a truth table column by column
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Practice: The converse of a conditional
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Final Revision: A conditional statement set in an everyday situation
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Quiz: The biconditional as two conditionals taken together
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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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Explain Back: Showing that a statement is a contradiction
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Final Revision: A longer statement tested for tautology
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Spot My Mistake: Arrangements with two particular items adjacent
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Practice: Circular arrangements with two people together
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Final Revision: A word problem about seating at a round table
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Quiz: Selecting from two groups at the same time
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Spot My Mistake: A selection with at least a stated number of one kind
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Final Revision: A word problem about choosing a delegation
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