1,019 prompts matching "A set closed under one operation but not another"
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WAEC Prep: Subtracting one 2 by 2 matrix from another
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Worked Example: Testing whether a binary operation is closed on a given set
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Final Revision: Deciding whether a set under an operation forms a group
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Show All Working: The time at which two bodies are nearest one another
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Spot My Mistake: Orders that make a product possible one way round but not the other
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Learn: Subtracting one vector from another
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Quiz: Subtracting one complex number from another
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Spot My Mistake: Dividing one complex number by another using the conjugate
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Learn: The velocity of one body relative to another
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Final Revision: Interception, where one body must catch another
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WAEC Prep: The probability of at least one event in a Poisson distribution
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WAEC Prep: Why the total area under the normal curve is one
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WAEC Prep: The standard normal distribution, with mean nought and variance one
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WAEC Prep: When a Poisson distribution approximates a binomial one
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WAEC Prep: A three-dimensional vector parallel to another
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Learn: The union of two sets written in set-builder notation
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Spot My Mistake: Finding the inverse of an element under a binary operation
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Spot my mistake: Assuming moments may only be taken about the pivot and never about another point
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Spot my mistake: Treating the dot product of two vectors as another vector
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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