1,034 prompts matching "Showing a set is not closed by a single counter-example"
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Showing that fg(x) is not the same as gf(x)
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Worked Example: Testing whether a binary operation is closed on a given set
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Spot My Mistake: Dividing one complex number by another using the conjugate
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WAEC Prep: Subtracting one 2 by 2 matrix from another
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WAEC Prep: Checking a single entry of a 3 by 3 product
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WAEC Prep: The forces on a body suspended by a single string
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WAEC Prep: A knot held in equilibrium by three strings
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Show All Working: Replacing two parallel forces by a single resultant
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What a function is and function notation
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WAEC Prep: Raising a 2 by 2 matrix to the third power
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WAEC Prep: Comparing two values from different normal distributions by z-score
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WAEC Prep: Showing a triangle is right-angled using the dot product
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Learn: Finding displacement by integrating velocity
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WAEC Prep: The remainder when a polynomial is divided by a quadratic
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WAEC Prep: Dividing a polynomial by a linear divisor by long division
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Learn: The union of two sets written in set-builder notation
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Common Mistakes: Showing that intersection distributes over union
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Common Mistakes: A binary operation defined by arithmetic modulo n
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Show All Working: Solving a cubic equation by factorisation
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WAEC Prep: Writing a solution set in interval notation
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